Aims. In addition to the large surveys and catalogs of massive young stellar objects (MYSOs) and outflows, dedicated studies of particular sources, in which high-angular observations (mainly at near-IR and (sub-)mm) are analyzed in deep, are needed to shed light on the processes involved in the formation of massive stars. The galactic source G079.1272+02.2782, a MYSO at about 1.4 kpc of distance that appears in several catalogs, is an ideal source to carry out this kind of studies (hereafter MYSO G79). This is because of its relatively close distance, and the intriguing structures that the source shows at near-IR wavelengths. Methods. Near-IR integral field spectroscopic observations were carried out using NIFS at Gemini-North. The spectral and angular resolutions, about 2.4-4.0 Å, and 0 . 15-0 . 22, allow us to perform a detailed study of the source and its southern jet, resolving structures with sizes between 200 and 300 au. As a complement, millimeter data retrieved from the James Clerck Maxwell Telescope and the IRAM 30 m telescope databases were analyzed to study the molecular gas around the MYSO at a larger spatial scale.Results. The detailed analysis of a jet extending southwards MYSO G79 shows cork-screw like structures at 2.2 µm continuum, strongly suggesting that the jet is precessing. The jet velocity is estimated between 30 and 43 km s −1 and its kinematic indicates that it is blue-shifted, i.e. the jet is coming to us along the line of sight. We suggest that the precession may be produced by the gravitational tidal effects generated in a probable binary system, and we estimate a jet precession period of about 10 3 yr, indicating a slow-precessing jet, which is in agreement with the observed helical features. An exhaustive analysis of H 2 lines at the near-IR band along the jet allows us to investigate in detail a bow-shock produced by this jet. We find that this bow-shock is indeed generated by a C-type shock and it is observed coming to us, with some inclination angle, along the line of sight. This is confirmed by the analysis of molecular outflows at a larger spatial scale. A brief analysis of several molecular species at millimeter wavelengths indicates a complex chemistry developing at the external layers of the molecular clump in which MYSO G79 is embedded. We point out that we are presenting an interesting observational evidence that can give support to theoretical models of bow-shocks and precessing jets.