Malicious PDF — malware analysis report

Static analysis result for SHA-256 affdfe3101c74556…

MALICIOUS

PDF

48.4 KB Created: 2021-05-19 22:38:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ddf33e85557a616f31aa1e227b1d7784 SHA-1: fe0ece8be347214ac3ea282489490f6f08a6e19a SHA-256: affdfe3101c745561f3ba5f8378b0dc58c273607242d88c2f3ababc264366c19
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick users into interacting with these links, likely to download further malicious content or visit scam pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/win-free-robux-game-hack
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/pubg-uc-free-2021_GM1330123889.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-coins-coin-master-no-human-verification_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-34-6-hack_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-free-spin-group_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-online-free-spin_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-hack-program_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/hack-coin-master-pc_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-robux-no-generator_GM431946152.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/minecraft-free-play-no-download_GM479516143.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/robuxmatchcon_GM431946152.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-coin-master-spins-link-download_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/can-you-really-hack-coin-master-ios_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-hack-generator_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-robux-apps-that-work_GM431946152.pdf
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-daily-1-ga_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d29.bin
d32af6767002812fe0872294e0f459d8c41d35fc3931fb92e8095b60c816c4e4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D29 29760 bytes
font_01_sfnt_off0000913e.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913E 2824 bytes
font_02_sfnt_off00009aec.bin
abf0b8ed31f5047ebf3c1463738251345f2a3e8ea43e3f17fb5c5b26bb0b5a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEC 18332 bytes

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