If a Tree Falls (2010)

Siblings Brad and Lisa Carpenter, along with two lifelong family friends, Will and Vanessa, set out to cross Eastern Canada en route to an annual family reunion. Their road trip takes them through the scenic, isolated countryside of New Brunswick on a blistering hot summer day. They eventually make the decision to find an appealing place to stop halfway, and camp for the night. Thinking they have found the perfect haven, the group is awakened by strange noises in the forest. What ensues is a violent disturbance by masked assailants, without motive, without reason. The group find themselves living a nightmare of psychological games and physical terror; as morning dawns, the reality of what will come is more horrifying than anything the group could have ever imagined.