Malicious PDF — malware analysis report

Static analysis result for SHA-256 834c92007ccda4fc…

MALICIOUS

PDF

34.6 KB Created: 2021-05-23 18:03:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: adc0c1d997865117e17ad9689e2fe207 SHA-1: cff701779b2531e3c8c0f8e4722fc6f0d9867e67 SHA-256: 834c92007ccda4fc5830dcd1872c7e783bd0e01e8079bc9c2216943056024f2e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document exhibits multiple high-severity heuristics indicating a social engineering lure. It presents a fake download button and prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The embedded URLs, particularly the one pointing to 'freer-pro-tiktok-game-hack', suggest a lure related to game cheats or hacks, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

Heuristics 5

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/freer-pro-tiktok-game-hack
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-hack-coin-master-game-2021_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/flip-master-coins-hack_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000321e.bin
8ead622621817bc0c904c01745ded99a3cf5912b922f889df37b1b049ce58af2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x321E 23616 bytes
font_01_sfnt_off000067bd.bin
ce89ed17beb43e5874c760a665d90bca09271831bf209f2f19e5d757293baf95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BD 17612 bytes

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