/usr/lib/x86_64-linux-gnu/libppl.a is in libpplv4-dev 1:1.1-7ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpplv4.a
/usr/lib/x86_64-linux-gnu/libpplv4.a