Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fc6ee88b37651b…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 04:19:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3e9a606efc2a50e0bdfaf1c5ffcad5e1 SHA-1: 8e6c80a77885784c156cd7813e1e85c116968be7 SHA-256: c5fc6ee88b37651b6354480bbbf8cacebccd9342cf9d82df939e757d103900e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to PDF files with SEO-like slugs, suggesting a link farm designed to drive traffic or distribute malicious content. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-google-play-promo-codes-coin-master-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-adder_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E31 24588 bytes
SHA-256: a50e385a9826fc26509cfc2432e831e869e8d30a6987e718c4f415f252f9f3c9
font_01_sfnt_off000086d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D7 18840 bytes
SHA-256: 390da4ab381e5da0f3a1dba4b04518bf56609a6cb8a6a234a2d345ffc47ec2de

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