Malicious PDF — malware analysis report

Static analysis result for SHA-256 9beaf4ab8e7a5e81…

MALICIOUS

PDF

31.8 KB Created: 2021-07-19 07:00:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f7aacde4ac0454c7d0ab7df9a85c83fb SHA-1: de2643066df823f85e5248aa41c56fc0d8f3002c SHA-256: 9beaf4ab8e7a5e8140854908a8251a6af82eae2532154b482fc74c9eb9989be9
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' and displays a fake CAPTCHA to trick users into clicking a link. This link, http://netcdn.tw/app/431946152/free-robux-without-human-verification-2021-game-hack, redirects to known malicious infrastructure. The document's structure and content suggest it is intended as a phishing attachment to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0622

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 http://netcdn.tw/app/431946152/free-robux-without-human-verification-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
font_00_sfnt_off0000211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211F 23532 bytes
SHA-256: 83926217bcfcda5f2fe2165c72c240b3c2f1d8cbb38c69ade0f152b1115ffdd7
font_01_sfnt_off0000564b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x564B 19812 bytes
SHA-256: 5b4e181d9a4435d0dbb05dc5edc73d8a1f896d56f758db28aef9602e53bf5b5b