Malicious PDF — malware analysis report

Static analysis result for SHA-256 d903dfed818aef08…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 15:17:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9d515459359005076408521e5cc27280 SHA-1: 69cf702d704f4d0bd1d52592e80ba668b7a8a846 SHA-256: d903dfed818aef0869db5e4e17fab7984db411eb24bf6b3623869872b1bb1bbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/best-free-spin-app-for-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed to lure users to potentially harmful content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/best-free-spin-app-for-coin-master-game-hack In PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-free-online-game-no-download_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/dragod-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-roblox-account-with-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-tk-hack_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-generator-no-human-verification-2021_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_off00003544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3544 23080 bytes
SHA-256: c254b43df14baf18fa71386c88950b429ca8d2bfcffa9654aab797c47d3c61c2
font_01_sfnt_off000068f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F3 18388 bytes
SHA-256: aeda58ff5a32b49ec09e40af11fd05ed5a2d12f2d07600bfa5490f3031411085

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