Final answer:
A hacker contracted to perform an attack against a target system with malicious intent is a Black hat hacker. They might use methods like exploiting vulnerabilities or phishing to break into systems.
Step-by-step explanation:
If you have been contracted to perform an attack against a target system, the type of hacker you would be classified as is a Black hat hacker. Black hat hackers are individuals who gain unauthorized access to computer systems or networks with malicious intent, often for personal or financial gain. They use a variety of methods to break into websites, including exploiting software vulnerabilities, sending phishing emails to get people to click on links, and using social engineering to lure people to give out information.