Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8d6e2faee82f8a…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 11:54:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 43fb77f203f021fdc46653f653e48a32 SHA-1: 83967400ffd64e6315478c0cb54390aa1aa4dcf3 SHA-256: 6e8d6e2faee82f8ae4a2b028f697f2708e8705e7056b321b99d03251b77fe95a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, forming a link farm, and directly advertises a 'Free Robux Generator'. The ML classifier strongly indicated maliciousness. The embedded URLs likely lead to scam pages or further malware, attempting to exploit user interest in in-game currency. No scripts were extracted, but the PDF structure and link farm are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/free-robux-generator-no-human-verification-2021-game-hack
    • https://ifef.es/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/give-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-real_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-studio-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/are-robux-generators-safe_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-online-free-spin_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/can-you-give-me-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coin-master-spin-and-coin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005228.bin
99b4c4f80b9cb2a7c40f0ddd22b94f306d0f066df45de5f17b68be1453e7a420		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5228 24868 bytes
font_01_sfnt_off00008baf.bin
cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 19260 bytes

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