Malicious PDF — malware analysis report

Static analysis result for SHA-256 42294e5b23f3436c…

MALICIOUS

PDF

31.0 KB Created: 2021-07-19 07:39:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89f9eab7170b1057b7befb4ce9be31fe SHA-1: a53dab1de6d6b7426cebfedd37ef32c70a0f0099 SHA-256: 42294e5b23f3436cef8e59b664d50162db916fc06695cb1eba56fa7d3815230d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to known malicious redirector infrastructure, specifically designed to lure users with promises of game hacks or generators. The document body and heuristics indicate a clear intent to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0827

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-blog-game-hack In PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-coin-master_GM406889139.pdfIn 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_off00002453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2453 22608 bytes
SHA-256: 4551af0c9cefdaae7401dc4dc2b7f22975f5626b29799a5648804639e6e38410
font_01_sfnt_off00005706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5706 18464 bytes
SHA-256: a2c76306a813766f02d16bba13a6176cc917de49c90529db8e6e2ffa1e8149db

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