Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b2ee8a1a98783f…

MALICIOUS

PDF

34.8 KB Created: 2021-05-23 06:37:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 903a7d2996768e041a1979cc61f24279 SHA-1: ad6f0ba643901efeb37512f296a3d104f9d5e877 SHA-256: c7b2ee8a1a98783fdf800222f137879bf1f728020c0c1ef013823108cd4a902d
122 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering 'free generators' or 'hacks' for popular games, a common social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install something, potentially a malicious browser extension or viewer, to access the promised content. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/how-to-get-free-tiktok-coins-game-hack PDF link annotation
    • https://www.brainpads.com/images/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000312f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312F 24256 bytes
SHA-256: a616c076547e0de86da42d16316cea7552564790ddf6858744021b526610acfc
font_01_sfnt_off00006864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6864 17620 bytes
SHA-256: 5e08b925a0f8fe2d80e54c1999b1c3763f905cccf1acde0f5739739445e42325

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