Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f2f0d9347b70cd…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 15:29:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e7370e931fba6af64e54c62ae49821aa SHA-1: 32e19d3cd640ef2c74afa9fbb2a99de2fd2b0e32 SHA-256: e8f2f0d9347b70cd444d18631a8e12dbd6ff4085d3edb5033583f476432e582e
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a 'download button' lure, all pointing towards a link farm designed to trick users into downloading malicious files. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a deliberate attempt to host a large number of SEO-optimized links for deceptive purposes. The primary IOC is the initial download URL, which likely leads to a second-stage payload.

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.co/app/431946152/instant-robux-free-game-hack
    • http://www.woundcare4heroes.org.uk/uploads/files/files/best-free-spins-link-coin-master_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-hack-download-pc_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/cheat-car-crusher-2-update-11-roblox_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-rewards-free-spins_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-realistic-minecraft-texture-packs_GM479516143.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-level-hack-cheat-engine_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/giftrobux-com-generator_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-live_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-roebucks-com_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-32-hack-apk_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-cash_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-spin-coin-master-link-download_GM406889139.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-steves-one-piece-hack-steve-shift_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-robux-cards_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/robux-generator-without-human-verification_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-free-no-virus_GM479516143.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-to-hack-roblox-infinite-robux_GM431946152.pdf
    • http://www.woundcare4heroes.org.uk/uploads/files/files/easy-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000303f.bin
86693f4ba21c262e88e64658b5dd642376c88df21dd4dea43128dee0e313763f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x303F 22700 bytes
font_01_sfnt_off00006301.bin
3e881d80b3e379552ae785751ab4d5169716e07ac9fac8a9be3ac3d2debe6078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6301 18820 bytes

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