Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2c26d0fa23c17e…

MALICIOUS

PDF

43.5 KB Created: 2021-06-09 14:49:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: afda983fa216f374b27fe59c4ab33702 SHA-1: 26cd7bd133a055aa4826b52e3b6126f379800c53 SHA-256: 8b2c26d0fa23c17e8ac1f81a423a333b64fdf993e23685c00e2e86d440141001
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL and numerous other URLs point to sites offering hacks or free items, reinforcing the social engineering aspect. 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.tw/app/431946152/free-robux-hack-human-verification-game-hack
    • http://feuerwehr-rheinau.de/images/coin-master-33-hack-version-download_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-coin-master-s_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/hacking-apps-for-roblox_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/free-robux-gift-card-codes_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/roblox-hack-fliight_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/how-can-i-get-minecraft-for-free_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/get-free-robux-now_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/roblox-hack-me_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/how-can-i-get-robux_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/roblox-help-free-robux_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/toolbox-mod_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/cheat-roblox-offensive_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-hack-with-lucky-patcher_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-hack-iosgods_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/roblox-assassin_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/wwwcoin-master-free-spincom_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-hack-cydia_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-coin-master-spins-link-download_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d24.bin
60cd6d750ac8638b83a9efe1763d0678df2a52e5231a228e730ff213119aba48		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D24 24412 bytes
font_01_sfnt_off00008536.bin
5187e9fd44232de1e2f5af405bdefce67dfc569c4d59d4154d514e966f23832a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8536 19028 bytes

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