Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1766957f23deda…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 11:10:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f7e84ce5092aa51ecd5c525fab969f9d SHA-1: 6f05816230f3372302aefd4c7f5cb4830a93e8ad SHA-256: ec1766957f23dedaaf669460436fd4fa68739344bf072eb3dbcbe600da4ca543
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick users into clicking a link. This lure is designed to lead the user to download a secondary payload from the embedded URLs. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.online/app/406889139/coin-master-villages-game-hack
    • https://ifef.es/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-claimer_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-2021-download_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/toolbox-for-minecraft-windows-10_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-apocalypse-rising-hack_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-skins-download-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-for-chromebook-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/complete-offers-for-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-fans-on-tiktok_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-download_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-gratis_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005116.bin
45cde64e96973e993298c4e810fa4b2ce537849be34264c1188d5aa1f2f27cc4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5116 25836 bytes
font_01_sfnt_off00008ca0.bin
a8028c0297769aa7dba6e0a54b0a1dc6e5838f70d2f821663f5d8e8c2692d7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 18044 bytes

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