Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998f8ac3f14bfc6…

MALICIOUS

PDF

41.4 KB Created: 2021-04-30 20:33:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e18b7ced9d78da70cf1c3a743606e373 SHA-1: 0244ef785f568acd8bb60036c0085c77a602c9d8 SHA-256: 3998f8ac3f14bfc68d9ef12291196ef0bb2b05efff9099314f99e6f8737f5511
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or 'game hacks' for Roblox, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF_GAME_HACK_REDIRECT_LURE heuristic confirms the deceptive nature of the links. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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.
  • 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/431946152/roblox-skyline-hack-game-hack PDF link annotation
    • https://fridaytravelnepal.com/userfiles/files/free-robux-gift-card-hack.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-xbox-one-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-model-purchase-request-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-2021-account-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-code-2021-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/is-there-a-way-to-get-free-robux.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/redeem-code-roblox-free-robux-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-flood-escape-2-hack.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-gamepasses-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-builder-club-free-code.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
font_00_sfnt_off000040da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40DA 28068 bytes
SHA-256: 8b5fafdcff27f5657c841d4f09913943ddfda33422e8b4f1af9107343f4d6917
font_01_sfnt_off00007f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F80 18484 bytes
SHA-256: 2017512bc55ca3edd7357c835a9aebbb9069fdc752fee5029c426f67db6f31e5

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