Malicious PDF — malware analysis report

Static analysis result for SHA-256 c107aaf79fc0118b…

MALICIOUS

PDF

38.4 KB Created: 2021-05-10 13:13:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9656b7342df29105e77b7b340f510ad3 SHA-1: 487c5ff2273e22582a0cc205261cd72b66e00672 SHA-256: c107aaf79fc0118b93247e3fd79016e0d04fbcd1a51618d431da5fafb9fa7cab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external websites, masquerading as 'free generators' for popular games. It also displays a fake CAPTCHA or human verification prompt to trick users into interacting further. The ML classifier and heuristic firings strongly indicate malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-coins-and-spins-daily-summary-game-hack In PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-meme_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_003_off000038ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38AC 25152 bytes
SHA-256: 98839f601a54de413084fdc50bddca443fd981173696a5d800c779ed39b7ba6e
font_01_sfnt_off000072b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 18880 bytes
SHA-256: 80e94ef00212ac5fe4220c165773dd6e8ea516dcb328b8ee80116dae5b806def

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