Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1b71ee7b66cea2…

MALICIOUS

PDF

47.6 KB Created: 2021-06-11 08:18:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 96fdedbd67dc1c311a2ec747e82fe175 SHA-1: 5f19c6115c64b61c89e10825a8595a1f3f5bead9 SHA-256: 4c1b71ee7b66cea2cdce0d18719b27c51c8a8681d0d7a13b82cc34ee3a9073af
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking through to external sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-roblox-speed-hacks-cheat-engine-game-hack
    • http://katalog.iain-padangsidimpuan.ac.id/repository/roblox-games-that-cheat-engine-works-on_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/easy-robux-today_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/daily-free-spins_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/coin-master-hack-without-human-verification-india_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-roblox-accounts-2021-dantdm_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/rbx-robux_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/websites-to-get-free-robux_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/minecraft-java-edition-for-free_GM479516143.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/money-for-roblox-strucid-free_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/best-hacked-client_GM479516143.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/how-to-make-things-free-on-roblox_GM431946152.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/minecraft-pe-hacked-client-download_GM479516143.pdf
    • http://katalog.iain-padangsidimpuan.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005594.bin
3f2f7e27124a0acaf94640d5c25a45180c6f5e06c0abf16daeb6715d1ebc19e6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5594 27500 bytes
font_01_sfnt_off00009461.bin
f6b50cb866336c486a4676ab3419d88d65d70f83b7695f621910de9893588073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9461 19372 bytes

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