The cracks used for pirating softwares are almost always containing some type of harmful code in them. Cracks always ask for admin privilege to run. Once you give them that privilege, they can do anything to your PC. They can install a keylogger in your PC which will record all your keystrokes and send them to attacker. These keystrokes will contain username and passwords for your social media, bank and email accounts. The cracks can also install a ransomeware on your PC which will encrypt your entire hard disk and ask for money to decrypt your data back. They can also install virus and worms to affect your PC.
So, stay away from cracked or pirated softwares. They will do more harm than good.