Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aa9e881fda59ee…

MALICIOUS

PDF

41.2 KB Created: 2021-05-04 18:20:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 203c041276c1f0996886cbb781e07e0f SHA-1: 052e3bea7d7724458fc228a1f6d57c858dd52364 SHA-256: 66aa9e881fda59ee4edfcd383f65b22e30054fa644dcc10c4743a36ec79a7559
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Blocking

This PDF document exhibits malicious behavior by instructing the user to disable security software, a technique often used to bypass defenses for subsequent malicious actions. It also contains numerous embedded URLs pointing to potentially harmful content related to game exploits and cheats, suggesting a lure to download further malware or engage in phishing. The ML classifier strongly flagged this PDF as malicious, reinforcing the suspicious nature of its content and linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/are-roblox-hack-clients-a-thing-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheat-roblox-jailbreak-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-instant-inspect-element.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-hat-in-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-accounts-i-hacked.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-bc-free-trial.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-images.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/does-roblox-detect-hacks.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/download-roblox-pc-windows-10-free.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/get-free-robux-no-fike.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-generator-website.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4098 27172 bytes
SHA-256: aa7caf9dde9d7254359a5c37a1e7d16396e77487d5de6ad9f975a57399f9ce0d
font_01_sfnt_off00007d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D72 18860 bytes
SHA-256: 405621c7cc0548cc3723d30698681222da0b710d397ef44361dc59318d30f65d

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