Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1bac331c8ff688…

MALICIOUS

PDF

30.9 KB Created: 2021-07-23 19:43:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: da448fd7fdcbdad8901559ae5d7424b1 SHA-1: 1c70ce04743d81f6a81a166875f4a59d1a09cd76 SHA-256: fd1bac331c8ff6887bd7f544ef8a0f8abc0776661d917d91041416f4a8dd09c1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for a 'free generator / game hack'. The embedded URL, http://netcdn.tw/app/406889139/free-coin-master-spins-and-coins-game-hack, is identified as malicious infrastructure. The document body also contains similar links and text suggesting a scam. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

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/free-coin-master-spins-and-coins-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_002_off00002511.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2511 22760 bytes
SHA-256: 51f8d29402b87b1a412afaf6fc155c0b94014bc395658fc70743eeef2a29751a
font_01_sfnt_off0000581d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x581D 18060 bytes
SHA-256: 55f53c4f18bfaf59a8fbb6d381f980c96a3f4ad908aa3278e43a985984e68094

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