Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21b704de4f1ff00…

MALICIOUS

PDF

31.0 KB Created: 2021-07-18 22:40:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2a695e42f95cfb07c53fc7ada003c9d7 SHA-1: 66934a0196a212b41d68704bb3dd747384a14ac8 SHA-256: b21b704de4f1ff00c80d4ed62755a24dfb76632bb73567f3c1bc1fd9f48f34fc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a malicious redirector link, specifically luring users with a 'free generator / game hack' theme. The embedded URL, http://netcdn.tw/app/406889139/coin-master-free-spin-today-game-hack, is identified as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to a malicious site, likely for a phishing or malware download attempt.

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/coin-master-free-spin-today-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_off00002417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2417 23028 bytes
SHA-256: a390e050b2ba06e717c44c37f08ab2a8a2e4d7364d5cf9330f36286fdec1eb6c
font_01_sfnt_off000057f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F7 18240 bytes
SHA-256: a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20

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