The study employs a sequential explanatory mixed-method design and aims to understand contract cheating behavior by conducting a survey of 1,081 undergraduate students in Indonesia and following up with five respondents to explore those results in more depth. In the first quantitative phase, we collected a variety of information from questionnaires about students’ practice with contract cheating. However, the interviews provided considerable depth of the students’ experiences, motivations, and attitudes toward contract cheating. Of the 1,081 participants, 73 students (6.75%) reported engaging in contract cheating. The survey responses revealed preliminary insight into students’ experiences with contract cheating and the prevalence of this phenomenon in Indonesia. In the semi-structured interviews with a subsample of survey participants (n = 5), we applied the theory of planned behavior (TPB) to elicit attitudes, subjective norms, and perceived behavioral controls toward contract cheating. Our study revealed that students will have a higher chance of pursuing contract cheating when: (a) they believe that contract cheating provides various benefits (positive attitude toward contract cheating), (b) many of their friends are doing the same thing and expect them to do the same (subjective norms), and (c) they can control their contract cheating behavior to avoid being caught (perceived behavioral control).