Malicious PDF — malware analysis report

Static analysis result for SHA-256 4966aeffcd1eac90…

MALICIOUS

PDF

49.6 KB Created: 2021-05-13 01:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4c853e42888f641f154251531d5394d0 SHA-1: 7d85cda13ee7964467930e46a38bff0e3ae9a429 SHA-256: 4966aeffcd1eac90ef5691544272a9955c18a4dbef744b23d2cc21027f54dc2b
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a game hack lure, directing users to a malicious redirector URL. It also presents a fake CAPTCHA, designed to trick users into interacting with the document, likely to download a secondary payload or execute further malicious actions. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0145

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-coins-and-spins-for-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000339d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339D 26952 bytes
SHA-256: f900ac677e0fce9146ae0ada939e4f278e372921cd24b49c32de7306f478c2c7
font_01_sfnt_off0000720d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720D 3872 bytes
SHA-256: a3c0efeccefd97c280011641d5dc31aa69c26891d378ab66323afbf3c86890fe
font_02_sfnt_off00007faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAA 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off000092d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D0 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120
font_04_sfnt_off0000b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41E 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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