Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8862e21a9d0ff…

MALICIOUS

PDF

37.2 KB Created: 2021-05-19 04:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fb7aeeffa93fa5a4fdaf0d64417a59c6 SHA-1: 7202dc185452cac848f288247f52e84f01a6e49e SHA-256: d5e8862e21a9d0ffa06f02ebda0954ac30c9f3f2f10d59029c333d99c847277e
190 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and links to known malicious redirector infrastructure, specifically a "free generator / game hack" lure. The document body and heuristics indicate a fake CAPTCHA is used to trick users into clicking the malicious link. While no scripts were directly extracted, the PDF structure and exploit heuristics suggest it is designed to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0666

Heuristics 6

  • 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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/free-robux-com-2021-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_003_off000033ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33CE 25296 bytes
SHA-256: 3ed45f92c527d475c8d33a88e7afdb2448e351d4b36f63f97047db57b958532e
font_01_sfnt_off00006ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 18676 bytes
SHA-256: db7deb15448d884d15c6a42f746ab8a768d26593fd7e085f0109997e06cd96ff

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