Cyber threat intelligence is a relatively new field that has grown from two distinct fields, cyber security and intelligence. As such, it draws knowledge from and mixes the two fields. Yet, looking into current scientific research on cyber threat intelligence research, it is relatively scarce, which opens up a lot of opportunities. In this paper we define what cyber threat intelligence is, briefly review some aspects for cyber threat intelligence. Then, we analyze existing research fields that are much older that cyber threat intelligence but related to it. This opens up an opportunity to draw knowledge and methods from those older field, and in that way advance cyber threat intelligence much faster than it would by following its own path. With such an approach we effectively give a research directions for CTI.