Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8d8406d1448d00…

MALICIOUS

PDF

41.7 KB Created: 2021-05-13 09:06:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 37ebb42fcce736469fc78d5236787002 SHA-1: 740b12ef9048cfa7e206fc39b1ad001c947ddf43 SHA-256: ea8d8406d1448d00b3997c61bbba3567f9424940232186439c32ffd6d406dce8
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a "free generator" or "game hack" lure. It also presents a fake CAPTCHA, a common social engineering tactic to coerce users into interacting with malicious content. The embedded links strongly suggest an attempt to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/legit-free-spins-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_off0000356a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x356A 24616 bytes
SHA-256: 420ca9d29808036ee044499bdfd1fb27c59683180df299e247759a4572a8d4d4
font_01_sfnt_off00006d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D60 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off000081eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 18176 bytes
SHA-256: 0e4f5fc6ff2fec7c34f7a60300b1fa14fa22cd043badad59a9fad54dc28be7cf

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