Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc9993620d82b2…

MALICIOUS

PDF

38.6 KB Created: 2021-05-12 12:02:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 21156d4fabc5d1ae36d0b9d50d33f403 SHA-1: dc3bc049761b0e3523df06ea2f577eff9b515256 SHA-256: 3cfc9993620d82b2ea07b44b25ba9c60be05a0aecf6ad00e0ad4638e731b4f16
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'Coin Master Free Spins And Coins 2021' lure. This link, https://netcdn.xyz/app/406889139/coin-master-free-spins-and-coins-2021-game-hack, is designed to trick users into downloading potentially malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to exploit user interest in game cheats to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-and-coins-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000343d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x343D 23844 bytes
SHA-256: 5ce136237c4ad324512987b3320562b29951448d95cf53f72136475f92e571b6
font_01_sfnt_off00006a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4D 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00007478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 18460 bytes
SHA-256: c259e1f543e24e5bfe6ce8cf601a342cc00786119f62dbfadbed712250492c46

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