Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4afa69ff1e7c53e…

MALICIOUS

PDF

35.9 KB Created: 2021-05-10 22:02:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 51bdc8143944b585cb73b930f681502c SHA-1: b8491104c20b9c2849c1f81123912e8cd21f045b SHA-256: a4afa69ff1e7c53e162beb7e040e6dde7db492a6ded4fa6dd1b23befa380cdfc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure for a 'game hack generator' that redirects to known malicious infrastructure. The embedded URL is the primary indicator of malicious intent. While no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/como-hackear-coin-master-en-espaol-game-hack In 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_003_off00003250.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3250 25016 bytes
SHA-256: 5c95776556989603ade1263589508b5ef4b33f418976a72a979fe9b246a2b90b
font_01_sfnt_off00006b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B25 18224 bytes
SHA-256: 123f8386315a91293958179ffe58ecd8d69104faea04a921c44476c066c42c52

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