It looks very much like Leptoglossus phyllopus: http://entnemdept.ufl.edu/creatures/orn/leaffooted_bug.htm. In the above link it mentions them listed as occurring as far south as Brazil.
It's closely related to the assassin bugs, but I think this one is a leaf-footed bug. It's a beautiful spotting, you're lucky that it decided to land on your backpack!
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