/usr/lib/x86_64-linux-gnu/libCGAL.so is in libcgal-dev 4.7-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libCGAL.so.11
/usr/lib/x86_64-linux-gnu/libCGAL.so.11