Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7d6cbe4af32c71…

MALICIOUS

PDF

53.6 KB Created: 2021-06-11 07:43:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6ecca36f98c073bd95ad42eb26b0a5c5 SHA-1: f1ede536ed95f033b8affa706fb4b19f55285d48 SHA-256: 6f7d6cbe4af32c71b8dfe6c9f64f621e3bef96424cd127d3f3742d40b4908298
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that direct users to websites promising free game currency or hacks. The document body and extracted URLs suggest a scam or phishing attempt to lure users to these external sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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.tw/app/431946152/how-to-get-free-robux-actually-works-2021-game-hack
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/roblox-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/create-minecraft-server-free_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/unlimited-spin-coin-master-hack_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-time-hack-ios_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-anime-t-shirt-roblox-adidas_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-no-verification_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/earn-free-robux-today_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/real-free-spins-for-coin-master_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-card-codes_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-no-rewards_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/cheats-for-lumber-tycoon-2-on-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054e4.bin
113329e30959b21260a21720ae94487a68c83480e58d9a282201c97910ee2807		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54E4 25400 bytes
font_01_sfnt_off00008fb5.bin
4e92cec989804acf45ef19508aa11332e73097f9b7aed58c0b41254a134abffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB5 8412 bytes
font_02_sfnt_off0000ab4f.bin
44ae57565c9428e2ee07ca65a86962105e8d9907e27d974ade807b17c6c54c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4F 19532 bytes

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