Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a3bef5d6a340c…

MALICIOUS

PDF

37.8 KB Created: 2021-05-22 21:40:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4390277a4af672c77c4ed285000d10b5 SHA-1: 69f7669df691427b0737f8f30b5e839a52ce0eab SHA-256: a21a3bef5d6a340c703a5155f9dc07fef2958905126f83854a298bbef667b616
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to websites offering 'free generators' or 'game hacks', a common lure for malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded links likely serve as a delivery mechanism for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/479516143/minecraft-windows-10-free-code-game-hack PDF link annotation
    • http://daksz.hu/images/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://daksz.hu/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://daksz.hu/images/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://daksz.hu/images/earnrobux_GM431946152.pdfIn PDF document text
    • http://daksz.hu/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B6 24788 bytes
SHA-256: e8280a9fa52d7e9bdc70a20d5f7ff769f554264163d3130366aa8cec1b0d6ce8
font_01_sfnt_off00006ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7466 18524 bytes
SHA-256: 61f4e129dbb086a6f9797ef369c55cdd3b58d633037fca8f4f59eaf5785788a4

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