Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0921fff848623…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 20:41:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c3850e7c3c4294db87cb96f5bfd3dd78 SHA-1: 2f8c4cd39b279bc23e15619d56afada24809b5ee SHA-256: 59a0921fff8486233db897fe7445dce9f0f8359b8542a159ced50362839d1915
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to drive traffic to malicious or deceptive content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick users into downloading further payloads or visiting malicious sites.

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/431946152/roblox-admin-hack-game-hack
    • http://lib.baruna-husada.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://lib.baruna-husada.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdf
    • http://lib.baruna-husada.ac.id//repository/is-minecraft-free-on-switch_GM479516143.pdf
    • http://lib.baruna-husada.ac.id/repository/master-coin-free-link_GM406889139.pdf
    • http://lib.baruna-husada.ac.id//repository/hacks-minecraft_GM479516143.pdf
    • http://lib.baruna-husada.ac.id/repository/get-free-likes-on-tiktok_GM835599320.pdf
    • http://lib.baruna-husada.ac.id//repository/google-roblox-games_GM431946152.pdf
    • http://lib.baruna-husada.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • http://lib.baruna-husada.ac.id/repository/roblox-inappropriate_GM431946152.pdf
    • http://lib.baruna-husada.ac.id/repository/worst-client_GM479516143.pdf
    • http://lib.baruna-husada.ac.id/repository/minecraft-free-download-ios_GM479516143.pdf
    • http://lib.baruna-husada.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://lib.baruna-husada.ac.id//repository/roblox-bloxburg-hack_GM431946152.pdf
    • http://lib.baruna-husada.ac.id//repository/legit-coin-master-hack-no-human-verification_GM406889139.pdf
    • http://lib.baruna-husada.ac.id/repository/nasl-roblox-a-cheat-engineden-hile-yapilir_GM431946152.pdf
    • http://lib.baruna-husada.ac.id/repository/get-free-robux-codes-email_GM431946152.pdf
    • http://lib.baruna-husada.ac.id/repository/the-final-stand-2-roblox-hack_GM431946152.pdf
    • http://lib.baruna-husada.ac.id/repository/how-to-hack-on-vehile-simualotor-roblox_GM431946152.pdf
    • http://lib.baruna-husada.ac.id//repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • http://lib.baruna-husada.ac.id/repository/hacks-for-vehicle-simulator-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e4c.bin
360b2b7069077f755fc3de42e6785247ad6f975ca8916872b8daa771f2615349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4C 21740 bytes
font_01_sfnt_off00005e11.bin
e5ca730804d66bebf4e5e52c5751bcc2b57707170b28c3b0ce40a6afaace4474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E11 19208 bytes

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