Malicious PDF — malware analysis report

Static analysis result for SHA-256 151e1f39b288bbcc…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 12:04:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a05c7d7087ea27a7e3aaa428de50b113 SHA-1: 8ff534f04a4e9374fc9ed2f38967b8888817a80f SHA-256: 151e1f39b288bbccc85f438cc677b86ea34dfcc4590d6d4d6b6c0fdd82e8d1e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting "game hacks" and "generators" for popular games. The primary malicious URL identified is https://netcdn.online/app/431946152/robux-earner-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/431946152/robux-earner-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pokemon-go-for-free-app_GM1094591345.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDA 23900 bytes
SHA-256: 8911a0881dd9c0fbf12f4009baff127ba392b1d3b177908e39ebdbc8f3e8c44e
font_01_sfnt_off00008425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00008dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD5 18076 bytes
SHA-256: f5a75b1f1fd7f518e5c7427b096eb9f92d711688fa0aea541fd532851a6f5025

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