Malicious PDF — malware analysis report

Static analysis result for SHA-256 6badc56a3ee2bbaf…

MALICIOUS

PDF

35.2 KB Created: 2021-05-22 16:07:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f86ee0820394c59b58b149937c3d5ce5 SHA-1: 0120a351fda5f9c2450561b4f7fb73bf3c9ff32d SHA-256: 6badc56a3ee2bbafb33f5e332b27ab3235e0264e35488d8dfbe2e8b41437f10d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'free spins' and 'game hacks' for Coin Master. The primary malicious URL identified is https://netcdn.xyz/app/406889139/claim-free-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a lure designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/claim-free-spins-coin-master-game-hack In PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E4 24868 bytes
SHA-256: 1f1cec9198c145da2055921f9e1dd6eeb4dc3e96ca6adc98d66242aaca8a1b50
font_01_sfnt_off000068ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 18220 bytes
SHA-256: a27868aca9095d1db43e3a34661a683bdd93dcaecb4c52cce590f5e85fca806a

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