Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f899b3e113e4f41…

MALICIOUS

PDF

40.4 KB Created: 2021-05-10 12:00:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 237a3f99e317085fc08c5bb2ad9a1fa2 SHA-1: 663bc99859fc80c4099b213ccd00b3891e7694c0 SHA-256: 4f899b3e113e4f419c921213f09d89df4d4b8a6599f4ff847d3941aacff72378
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body and heuristics indicate a lure to trick users into clicking these links. No scripts were extracted, but the primary function appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/how-do-i-get-free-spins-on-coin-master-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_off00003588.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3588 24900 bytes
SHA-256: a9293af0d46464e22b14965283ba11c719d752815a5f74060d7c1e029e076420
font_01_sfnt_off00006e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00007918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 19384 bytes
SHA-256: bb4bf41a4367b18e6f1b6df2491f0e54355092f347805b309837e4d65da3f7e0

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