Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8485cb8ac530495…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 23:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 157b6b8a40afd2f13abf3946176bb77a SHA-1: d4dab72f322fea8ace10cd972b85ae2bc90cea1f SHA-256: e8485cb8ac530495ae63c33d87a64ea0b376d00a935be782e7cae368b91e82b5
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URLs, one of which is directly linked to a fake CAPTCHA heuristic, suggesting the document's purpose is to redirect users to a site that likely hosts a secondary payload or exploits. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-how-to-get-japan-sushi-card-free-game-hack
    • http://safari-crimea.com/images/buy-robux-free_GM431946152.pdf
    • http://safari-crimea.com/images/roblox-free-play_GM431946152.pdf
    • http://safari-crimea.com/images/free-robux-real-2021_GM431946152.pdf
    • http://safari-crimea.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://safari-crimea.com/images/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://safari-crimea.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://safari-crimea.com/images/can-i-get-robux-for-free_GM431946152.pdf
    • http://safari-crimea.com/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://safari-crimea.com/images/wurst-client-download_GM479516143.pdf
    • http://safari-crimea.com/images/roblox-com-free-robux_GM431946152.pdf
    • http://safari-crimea.com/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://safari-crimea.com/images/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • http://safari-crimea.com/images/coin-master-hack-online-2021_GM406889139.pdf
    • http://safari-crimea.com/images/good-free-minecraft-server-hosting_GM479516143.pdf
    • http://safari-crimea.com/images/coin-master-free-spins-link-2021-hack_GM406889139.pdf
    • http://safari-crimea.com/images/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdf
    • http://safari-crimea.com/images/how-to-get-free-roblox-money_GM431946152.pdf
    • http://safari-crimea.com/images/near-tiktok-free-view_GM835599320.pdf
    • http://safari-crimea.com/images/tiktok-free-hit_GM835599320.pdf
    • http://safari-crimea.com/images/can-you-really-hack-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004819.bin
84c9c820367d341c8bf75a3d831e0fb942f016d03582fed5937cc05eb658a0a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4819 27920 bytes
font_01_sfnt_off000084ee.bin
b658d8f1c141fc8c479f08926c8ce77f4430151ae81ac58e32bab20f08e84866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EE 18696 bytes

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