Here are some info glanced from a safety audit by China Southern which is currently floating around on the internet. Some info may not be accurate as charts for this airport are proprietary information.
AFAIK No ILS at ZYYC Yichun, VOR-DME/NDB-DME only.
Runway 12/30, dimensions 2300m/45m
Rwy 12 approach has higher MDH, a/c on approach to level at MDH at 4 DME.
Procedure turn for rwy 30 approach starts at 3800ft due to steep terrain, (note not in meters) descent gradient 5.8 deg. (FPA 3.4 deg)
Night ops to be banned on 1st September. (Note the report is for CZ)
Flights from Harbin must carry return fuel in case weather stuffs up.
IMO it looks like a CFIT during approach, rather than a runway overrun.
Edit:Typo