Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5ad0bfe0ae7a40…

MALICIOUS

PDF

36.7 KB Created: 2021-05-11 20:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4962318fa04e9c0fb47da4ee7f5920c SHA-1: 129fd5311c99c19eaf34be304fc0097d761b5571 SHA-256: 9d5ad0bfe0ae7a40c528bbdb8a5ab6cd6dcea02108baf3ec97c1dcb3ef27bc5c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links that redirect to malicious infrastructure, specifically promoting a 'free generator' for Coin Master. The document body and heuristics indicate a lure designed to trick users into visiting a potentially harmful site. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/how-to-get-free-spins-coin-master-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_off0000353c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x353C 25856 bytes
SHA-256: d032dc04be597981e49ac9e941c6c5ba2afdcc15387a3772edb886797e55ebca
font_01_sfnt_off00006eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEF 18052 bytes
SHA-256: 3cfae0e628493b06a11893ba870a091d0c1d4835c1ebffdd70b8f2a1c7d637a9

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