Malicious PDF — malware analysis report

Static analysis result for SHA-256 f761b7c193aa7b1d…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 09:33:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 69fea2c550e77f9948a5d37e9703f846 SHA-1: 6b6e79b8200410aeb8ea87cf311115abe3b7f0f8 SHA-256: f761b7c193aa7b1da92b8b356f740b24ae647b609e3322fce7ac831ddf5c451b
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 leading to a 'Coin Master Free Spins' lure. The document body text and heuristics confirm the intent to trick users into clicking these links, likely to download further malware or lead them to a phishing site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0142

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-links-2021-game-hack In 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_003_off00003580.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3580 32200 bytes
SHA-256: 9933e8e8519f5d12673ae9e556f048aeaddec10ccaeed2a7e6aed110712aa0f0
font_01_sfnt_off00007c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2F 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off000089b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B7 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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