Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfcaae6c0615888…

MALICIOUS

PDF

32.6 KB Created: 2021-07-04 01:09:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d673074f48f2ac5cce46917249c2eb8a SHA-1: c7fd9c8865eeb2866d98c80b4a17d3e83d0ee1dc SHA-256: bdfcaae6c0615888c86be97bdcee833f2ef273e9ee0adccbbd1e92a9bc190fab
168 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links to redirectors, masquerading as free game currency generators. The primary link, http://netcdn.tw/app/431946152/free-100-robux-game-hack, is identified as a malicious redirector. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to download further payloads. The document body's content and the heuristic firings strongly indicate a lure for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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-100-robux-game-hack In PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/roblox-jailbreak-hack-application-free_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-roblox-girl-clothes-codes_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-robux-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-hack-version-33-2_GM406889139.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_off00002a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A65 21768 bytes
SHA-256: 98ea9d834c9d80ebd0c0ce9ba3592e4060738ddfed50fbc304c783961c64ad4a
font_01_sfnt_off00005a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9C 18996 bytes
SHA-256: 50307759301c9532eb20b67e87d9cc20f2fa9f514687c8f0dcdabe953bf72270

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