Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc57b72e58aad20…

MALICIOUS

PDF

32.0 KB Created: 2021-05-16 10:12:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d7f7e7a965c055822d0aa1c2cca797b SHA-1: 3b6390a3ef2235655c6e74a3de7ad0e14d09e9e6 SHA-256: 2bc57b72e58aad20ab6a93c73e5053ccceb8ac8ea71e0ae6d601c6b82d07806b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, identified as a link farm, designed to lure users to external sites. The document body and extracted URLs suggest a scam related to free in-game currency or software. The PDF_SEO_LINK_FARM heuristic indicates a high volume of outbound links, and the ML_NYX_PDF_MALICIOUS score further supports its malicious nature. The presence of embedded JavaScript, though not explicitly detailed, is common in such malicious PDFs for redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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/406889139/100-free-spins-on-coin-master-game-hack
    • https://yeushuen.com.tw/image/data/files/i-need-robux_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/get-roblox-for-free_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/get-free-coins-on-coin-master_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/minecraft-java-edition-download-free_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/card-hack-in-coin-master_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-no-verification-ios_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-free-gift-links-2021_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/how-to-send-free-spins-on-coin-master_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/freerobuxhack-us-2021_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/bloxpage-free-robux_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/como-hackear-juego-coin-master_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/minecraft-java-edition-for-free_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master-october-13-2021_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/juego-hackeado-de-coin-master_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link-facebook_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/free-roblox-characters_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-deals_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/cm-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000491b.bin
9111db96273a5dc1eff2373ec3a99db992b04e0cfd7d2872fc3fd78dc040be06		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491B 25216 bytes

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