The "crack" or keygen executable files often contain hidden payloads. Once executed with administrative privileges, they can install info-stealers, ransomware, or rootkits.
Forums are filled with users who have tried to install cracked software only to end up with broken systems. One user on a malware support forum, after installing a cracked Photoshop CS6, said, "I will not do that again," and then had to run extensive, hours-long virus scans. adobe photoshop cs6 1301 final multilanguage crack exclusive