Malicious PDF — malware analysis report

Static analysis result for SHA-256 c939c395bccff252…

MALICIOUS

PDF

37.4 KB Created: 2021-05-12 19:30:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5d60c87fccfaf6baf290379a42a239b3 SHA-1: 644298aafdbea57f0ff95708d02e14bbbc687928 SHA-256: c939c395bccff25218860d52cf85c017afef13d7635b97bccbfa38e0bc0399f6
130 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a 'coin master hack' lure, indicating a social engineering attempt to trick users into downloading potentially malicious content. The presence of embedded URLs and the heuristic firings strongly suggest this is a phishing or scam document designed to lead users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-hack-without-verify-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_off00003557.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3557 26000 bytes
SHA-256: 944eb5d64d2dd6188c363b3784f1a9c8d939f97ecf3b2fe2b814e5933e897c32
font_01_sfnt_off0000703e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 18532 bytes
SHA-256: 3e0328f2eb925fa9474b2fb0440a25955c930b3cfcf15d5dbe2ab1f8ad488f87

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