Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1534b80b917c71…

MALICIOUS

PDF

42.9 KB Created: 2021-05-15 01:38:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e8b40a447719e38aa6d66da8941fa0df SHA-1: f3cdabb0c482b96e26b6d8bf2ac0626a225f6bb3 SHA-256: aa1534b80b917c71b13e248cde0b3b843b140fc044f3189b48330c770f5c1bf8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links disguised as download opportunities for popular games, a common lure for users to download malware. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent to distribute unwanted content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-free-android-game-hack
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/multiplayer-master-hack-coins_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-install-free_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/rare-free-links-to-coin-master_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-2021-hack_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-robux_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-free-spins-and-chips_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/e-free-roblox_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spin-and-daily-news-coin-master_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spin-sites-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d27.bin
740a4a1f3d4d88954a77ca4f6440632e107c492dffa5d1e5f2259e11c3a57811		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D27 25284 bytes
font_01_sfnt_off000086cd.bin
82c3baf37781722f94369c3593b69e30ff14556e6fd52427afe75c94c9d4ce60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CD 17884 bytes

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