Malicious PDF — malware analysis report

Static analysis result for SHA-256 55666f00a0850b8a…

MALICIOUS

PDF

41.3 KB Created: 2021-05-12 06:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 65f4cf6a0e62a3232ddc85ec2fa30882 SHA-1: b8e99af8ee4e648cb3510c8068d915a7600a29c1 SHA-256: 55666f00a0850b8aa1ece2a7b5840372c860a6f829540bf578b1f7a6e2c150a0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which appear to be SEO-driven and point to other PDF documents, suggesting a link farm or a method to distribute malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading files. The ML classifier strongly indicates malicious intent.

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/406889139/gameoffice-net-hack-coin-master-game-hack
    • http://perpus.stmik-im.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • http://perpus.stmik-im.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/free-robux-for-free_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/roblox-army-robux_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-home_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-no-verification-2021_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-card-hack-app_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/minecraft-xbox-one-free_GM479516143.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/get-free-robux-no-verification_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdf
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdf
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004737.bin
4886ac9e1195f081d67fd6d4f4726b9c0f9bb5e195ef6d8103d3d12585979f89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4737 24812 bytes
font_01_sfnt_off00007fc9.bin
c1b1a17e523e936b349f536870acacfad228736640955d12968774eefee3ad4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC9 17976 bytes

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