As an interdisciplinary professional in data analysis, legal writing and academic proofreading, my skillset may initially seem outside of the box for this project. However, true to their diverse range, my competencies build on increasing attention to detail, logical thinking, and a dedication to the highest standards of output - traits that are exceptionally crucial when conducting a comprehensive penetration test like the one you've described. Moreover, I am also well-versed in Ubuntu and VirtualBox making me the perfect fit for your project's niche requirements.
My ability to adeptly use SPSS, R, Excel and Python further enhances my capability to identify and assess system vulnerabilities with painstaking precision. This guarantees you a confidently thorough report capturing every aspect of the penetration test conducted on your CTF machine.
Transparency within my work process is something I passionately advocate and which is why I promise total confidentiality by exercising strict non-disclosure policies. In short, my skillset combined with my commitment to a quick turnaround time while maintaining emphasis on quality make me your go-to expert in this project. Let's get started on hardening those virtual walls!