Malicious PDF — malware analysis report

Static analysis result for SHA-256 140b73d862d214d0…

MALICIOUS

PDF

32.3 KB Created: 2021-07-19 02:21:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e274eb75bdd1271ce0cbfae21f9a052f SHA-1: bd9a009b7c0c0ea5d21e42ee7d802305517cbe05 SHA-256: 140b73d862d214d084d5cc63bae52bf490ffc3705041f608b279d63e62314ae0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, specifically advertising "free generator / game hack" lures. The presence of a visual download button and the overall theme suggest a phishing or scam attempt designed to entice users into clicking malicious links. No scripts were extracted, but the document's structure and embedded links strongly indicate a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://netcdn.tw/app/431946152/robux-free-online-game-hack In PDF document text
    • https://www.stkdb.cz/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/ways-to-get-free-robux_GM431946152.pdfIn 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_off00002a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1C 22436 bytes
SHA-256: dd68b8c68f74fb0f29bbaeff6574744623b6985a3271935c0a0c51f7bc4de858
font_01_sfnt_off00005bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF7 18396 bytes
SHA-256: 8b1207cfb2f9bbbca91ced9084c95387876a7807fdcc2a33d02d36ee9800606a

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