Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50c56ec3c3eb35d…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 07:39:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3eb84a96db47a7bf81bcb774df70c2f8 SHA-1: 835c25a7f26c1123f49895dfb0f467af23a0c63c SHA-256: f50c56ec3c3eb35decb6aafdc5c1428f8189d00f23ce6b18edebbc0108dc2056
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, designed to trick users into interacting with the document. It also embeds external URLs, one of which is a direct link to a potential payload. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver malware.

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-hack-online-link-game-hack
    • http://feuerwehr-rheinau.de/images/free-robux-no-scam_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-hack-with-lucky-patcher_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-minecraft-account-and-password-generator_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/get-me-robux-for-free_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/install-free-game-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/roblox-admin-hack_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/roblox-how-to-get-free-clothes_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/minecraft-server-free-trial_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/robux-match_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-coin-link-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/free-robux-with-no-verification_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/se-puede-hackear-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-minecraft-mods_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/free-robux-hack-2021_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/free-robux-without-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b3c.bin
03326561a4cc1250b4fd95585c45a60875236628142252d6cd3bf10930361863		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3C 24248 bytes
font_01_sfnt_off00008287.bin
fe6378a35aaddd1df9c91bfaa88201bdad89d62d9f4d299995ec0f595f057003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8287 17788 bytes

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