Malicious PDF — malware analysis report

Static analysis result for SHA-256 9972dc78989198df…

MALICIOUS

PDF

30.7 KB Created: 2021-07-19 22:51:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 18547da631b4497f9447e44f354d66e9 SHA-1: 4bf987e6b2db2f28d6c671caaa9523c904fd1f0e SHA-256: 9972dc78989198df56cfc7b88c01d815efa1fdfb5a8f5d4ba19a23580f978e30
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a redirector link that leads to a 'free generator / game hack' lure. This link, http://netcdn.tw/app/406889139/coin-master-daily-free-spins-blogspot-game-hack, is associated with malicious infrastructure. The document body also contains similar URLs, suggesting an attempt to trick users into visiting a potentially harmful site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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-daily-free-spins-blogspot-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_off000020af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20AF 23212 bytes
SHA-256: 886c8b3050cc0945becbf7e645271bd1cec7e5e386b5c488452af0b596dd1193
font_01_sfnt_off000054d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54D7 18812 bytes
SHA-256: 99efaab321cd8bd4771148dad361c5d136942e4fae15d22f58752892cb19a04e

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