Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bdb351883c0b95…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 06:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c8403185cc8022f45a0c623f6f2e300a SHA-1: 7fdf17ffaa3b1f683ea6a75e5b92f77f80d08d63 SHA-256: c4bdb351883c0b95ece32f0d5aa31f413da25df8bd55c098ba76ccac1b165013
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a social engineering attempt to lead the user to a malicious site. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are likely used for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-free-spins-16-04-19-game-hack In PDF document text
    • http://digilib-unirow.ac.id/repository/pubg-uc-zong_GM1330123889.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/break-free-id-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-no-verification_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
stream_004_off00004d5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D5C 24532 bytes
SHA-256: 506d4d23af4e44953b4d90585e71753b2c1456832953ed819196d730846926ee
font_01_sfnt_off00008593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8593 18560 bytes
SHA-256: a0bbfc082f98783fdd447455211163ff4a121f10355b931e3c7b5c7609f08a4a

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