1 INTRODUCTION

2 CYBER THREAT INTELLIGENCE  
2.1 Definition  
2.2 CTI subdomains  
2.3 Uses of CTI  

3 RELATED STUDIES

4 METHODOLOGY  
4.1 Search strategy  
4.2 Selection of relevant studies  
4.3 Analyzing the studies  

5 CTI EXTRACTION PURPOSE

6 CTI EXTRACTION PIPELINE  

7 THREATS TO VALIDITY

8 CHALLENGES

9 FUTURE RESEARCH DIRECTION

10 CONCLUSION