Malicious PDF — malware analysis report

Static analysis result for SHA-256 b634abf6a497813d…

MALICIOUS

PDF

36.4 KB Created: 2021-05-10 12:07:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a10ef9451845af10b37261b3db1e1d9 SHA-1: bb11a04528758888f6e15490c1dcd119fb41a3ad SHA-256: b634abf6a497813d7925b29543eec67799953aaf34e6b520a8bde643cbc7fecd
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that are identified as malicious redirectors, specifically promoting a "Coin Master Free Spins" lure. The document body, though heavily obfuscated, contains similar thematic elements and the malicious URL. The presence of these elements strongly suggests a phishing or scam attempt designed to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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/coin-master-free-spins-today-daily-links-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
font_00_sfnt_off00003463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3463 25108 bytes
SHA-256: f5edfedb0c82736e8c9beed8e29532b823c0d519bb3fcfe0d1d68cc2ada5cbe1
font_01_sfnt_off00006bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCF 18652 bytes
SHA-256: 52d597ff4b9023df6b3510b92f87dc1d2329aed0448bc9fa59130058567cb992

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