/usr/lib/x86_64-linux-gnu/libtbbmalloc.so is in libtbb-dev 4.4~20151115-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtbbmalloc.so.2
/usr/lib/x86_64-linux-gnu/libtbbmalloc.so.2