On a video here:
First footage of Sukhoi Superjet 100 crash site in Indonesia - YouTube
..one sees the impression of the starboard wing and engine in the side of the cliff, and the port wing missing its engine a bit forward and below it some 10s of meters. So that gives direct information about the direction of travel.
The violence of the impact seems to have triggered the landslide, with implication that much of the wreckage will be intermingled with all that.