/usr/lib/linux-tools/4.15.0-1025-azure/perf is in linux-tools-4.15.0-1025-azure 4.15.0-1025.26~16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.15.0-1025-azure/../../linux-azure-tools-4.15.0-1025/perf