Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a46232991c1f2…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 14:59:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 91650a0b5358ec2eda5a66846be3b110 SHA-1: 2b7901977de019ee956f20ed10f20d6cae45449c SHA-256: 3c8a46232991c1f20ae6e09352568dc58abaa6df56ec39425f21f51f4ba23bab
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous links to external resources, many of which are presented as generators or hacks for popular games like Minecraft and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a coordinated effort to distribute potentially malicious content. The ML classifier also strongly flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/479516143/free-minecraft-account-generator-game-hack
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-get-free-robux-from-khaos_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/hurt-roblox-hack_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/minecraft-launcher-free_GM479516143.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-robux-content-deleted_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-chat-hacks-grab-knife_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/roblox-2021_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/free-clothing-on-roblox_GM431946152.pdf
    • https://irecruitersafrica.com/ckfinder/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000342c.bin
b4821c46996a0f48ce8617c4fa7489102ff54bf3e2ed59c75072bf87bb517324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x342C 22524 bytes
font_01_sfnt_off0000659c.bin
96e262c6d53304f841c0c810fa761a1b3e3647c443a06172135a50457bf60c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659C 18140 bytes

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