Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f635c49e664ee2…

MALICIOUS

PDF

36.8 KB Created: 2021-05-20 14:48:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d3112ee648b88314a588fdc66dbaddd6 SHA-1: 7dd7db8ae49d62fd78fc0454a5685c698d4a70b7 SHA-256: 84f635c49e664ee2698882c224cd49d26e60d7d1b6d3298b3d7a69321d7c7baa
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/free-robux-no-verification-needed-game-hack PDF link annotation
    • https://foc.vn/public/upload/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/hacks-roblox_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_off0000326b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326B 25120 bytes
SHA-256: 857e2498a03356b5648d04fd3d6c6d2551bbdde4559a418b3da5ffe864c5bc79
font_01_sfnt_off00006d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D20 18776 bytes
SHA-256: d142001b9e8124b93d34dd5eb493ac1502906b177ba9fa7077e4038994baf40d

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