Malicious PDF — malware analysis report

Static analysis result for SHA-256 492624e79d98923e…

MALICIOUS

PDF

44.3 KB Created: 2021-05-14 20:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4771ba87837f8588ed5d33addb8de83a SHA-1: 0489611b493db0fb947c2e8904a6e029ce4509d3 SHA-256: 492624e79d98923e8d6aa6b57555093a74752778474b91ac2245477e872ff1d8
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, many of which appear to be SEO-farmed content related to free game items. The presence of a "download button" heuristic and a high ML classifier score indicate malicious intent. The primary goal seems to be directing users to external sites that may host further malicious content or scams.

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 https://netcdn.xyz/app/431946152/freerobuxhack-us-game-hack
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-mod_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/oprewards-com-robux_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-make-a-roblox-group-for-free_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-online-hack-no-survey-no-password_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/rewards-roblox-com_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-50-spin-link_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/como-hackear-coin-master-gratis_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/minecraft-survival-hacks_GM479516143.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/roblox-army-robux_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-minecraft-skins-girl_GM479516143.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-account-roblox-with-robux_GM431946152.pdf
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-unlimited-spins-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d1a.bin
b2259af9f9750a969785fc00fa2707692ec731c8890c826121e1e67952635bb6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D1A 26596 bytes
font_01_sfnt_off000089a4.bin
eb8464b7a0addd56b603953feb3e29196181109f3d6ed00b0f5bffeafad9fb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 18764 bytes

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