/usr/share/acl2-4.3/books/hacking/redefun.acl2 is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | (ld "hacker-pkg.lsp")
(ACL2::CERTIFY-BOOK "redefun" ACL2::? T)
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