/usr/lib/x86_64-linux-gnu/libshadowsocks-libev.so is in libshadowsocks-libev-dev 2.6.3+ds-3+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libshadowsocks-libev.so.2.0.0