Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4697eddeb0d1d4…

MALICIOUS

PDF

35.5 KB Created: 2021-07-09 03:03:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 23c4ffe5ee20e2cee863b1a75538a786 SHA-1: 5fc0a243d8c7482852f8023c3e05078c41626808 SHA-256: 3d4697eddeb0d1d48f298df1d58f27cb2dfc1175ebc73f7423bb4794e46104dd
122 Risk Score

Malware Insights

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

The PDF contains a large number of links to other PDF files hosted on an IP address, suggesting a link farm designed to distribute malware. The document body and extracted URLs explicitly mention 'hack program', 'free robux', and 'coin master hack', indicating a lure for users seeking cheats or exploits. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/406889139/coin-master-hack-program-game-hack
    • http://1.179.208.67/ckfinder/userfiles/files/points-for-free-robux_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/roblox-hacking-website_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-to-get-into-roblox-games-for-free_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/free-roblox-promo-codes-august-2021_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/hack-download_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/minecraft-gun-games-free_GM479516143.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/coin-master-35-13-hack-download_GM406889139.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/easiest-way-to-get-free-robux-2021_GM431946152.pdf
    • http://1.179.208.67/ckfinder/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000344e.bin
43dd12c6d796244c58061a7c882544269b8029d8127f076e77aa304973081690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x344E 22900 bytes
font_01_sfnt_off000067af.bin
5741a127261724fddf521fc94ebfc06f31583a26a9f94a4c147a021759ab8b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 18416 bytes

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