I just checked, compared file by file then line per line with my Linux skills, two latest versions here with my original version from Wp-rocket.me.
The 3.9.0.5 version uploaded by
@Tomz is deeper nulled, be edited many files of original version to null and remove notifications in dashboard to make everything like real premium version! Anyway, it be not included any bad extra codes!
The version uploaded by @JohnFckerWick, is simple nulled, just edited two line of original version to help you use all features of WP-Rocket, but you will see some information in Dashboard not the same when you use plugin with real key license, no problem!
About your Fcking Hack, ton of WP Websites got hacked every hour, most of reasons are you not protected your a.ss with strong password, no hidden your back-end link, not keep your theme & plugins up2date, or used the bad codes on net and get friend with poor security hosting services!
I guess you be hacked not have reason come from WP-Rocket that you downloaded from here, because both version ok, and if the original version is the reason, maybe WP Secure Community did get crazy nowadays because WP-Rocket is real BIG GUY in the world!