Mystery files : Last Man Alive description

There has been a deadly pandemic for humanity. The virus has been very harmful for all and millions of people have died, others have changed and have become dangerous, irrational and evil people.
You seem immune and you are alone, in the mountains, driving an ATV to escape death.
Your car is broken, you have to walk and find a way to escape. But you are not completely alone, dangerous creatures lurk in the dark, endangering your life.
Adventure game like slender man, slenderina or Marian, in an open big world.