Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a359ca352cc52e…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 07:05:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: df007e28620d928155e065de64733779 SHA-1: 2a9310b733d11180375a7197ee6ed658b6d5c38d SHA-256: f8a359ca352cc52eca52ee5bc349e59ef5fbba7179ba09673bd4287ad40a4bc5
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a download button lure, aiming to trick the user into downloading a malicious file. The embedded URL points to a resource hosted on netcdn.xyz, which is likely a payload delivery site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/roblox-hack-download-game-hack
    • http://sfera-express.ru/images/hack-coin-master-apk-32-download_GM406889139.pdf
    • http://sfera-express.ru/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://sfera-express.ru/images/minecraft-114-4-download_GM479516143.pdf
    • http://sfera-express.ru/images/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • http://sfera-express.ru/images/free-robux-com-no-verification_GM431946152.pdf
    • http://sfera-express.ru/images/free-robux-hacker-us_GM431946152.pdf
    • http://sfera-express.ru/images/hack-client_GM479516143.pdf
    • http://sfera-express.ru/images/how-to-win-free-robux_GM431946152.pdf
    • http://sfera-express.ru/images/free-robux-quiz_GM431946152.pdf
    • http://sfera-express.ru/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://sfera-express.ru/images/roblox-hack-generator_GM431946152.pdf
    • http://sfera-express.ru/images/free-robux-group-payouts_GM431946152.pdf
    • http://sfera-express.ru/images/coin-master-hack-apk_GM406889139.pdf
    • http://sfera-express.ru/images/coin-master-free-coins-links-2021_GM406889139.pdf
    • http://sfera-express.ru/images/how-do-you-get-roebucks-for-free_GM431946152.pdf
    • http://sfera-express.ru/images/master-coin-free-spin_GM406889139.pdf
    • http://sfera-express.ru/images/hacks-roblox_GM431946152.pdf
    • http://sfera-express.ru/images/how-to-make-roblox-clothes-for-free_GM431946152.pdf
    • http://sfera-express.ru/images/roblox-play-as-guest-free_GM431946152.pdf
    • http://sfera-express.ru/images/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_off00004905.bin
5e7766c978400fa705a9f4486dd67ef295cd9bf6bc364e457c5b86779ca3b31f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4905 26648 bytes
font_01_sfnt_off000086e5.bin
777ecd9bf4cba19c66ac3b03e370a33bd01ed4cf882c145341853d771ac6f80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E5 18688 bytes

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