Malicious PDF — malware analysis report

Static analysis result for SHA-256 df71652ee3c166fb…

MALICIOUS

PDF

27.0 KB Created: 2021-07-06 07:18:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 391bbe906bd806454815b1aec4931d3e SHA-1: 83dd430723027bab4532ccdec0adf4fd55c2ab0a SHA-256: df71652ee3c166fb52e6a76f80bc540b3a05ed00d4e3cd94b35151a0108b9f8e
130 Risk Score

Malware Insights

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

The PDF file contains a lure for a 'free generator / game hack' which links to a known malicious redirector. The document body also contains the same malicious URL and a call-to-action phrase, reinforcing the phishing attempt. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent, likely leading to a further stage of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0372

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 http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-app-download-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
font_00_sfnt_off00001631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631 21844 bytes
SHA-256: a7d9bd75a6e53b9d9c885c8ad92d7b616628f8bc7e7728beb627e6f7d278ea37
font_01_sfnt_off00004679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4679 18756 bytes
SHA-256: d83686db471f8f245c2f8ef1f44426007a21de0d25beaa974be47c01623e4190

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