Malicious PDF — malware analysis report

Static analysis result for SHA-256 b393bc3335436f30…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 13:24:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fdb00f81fc466ae6536e0080be6b0adc SHA-1: d74f6165f5add0beb3e0d075e21c4da4e4166ef7 SHA-256: b393bc3335436f30d2b22131beea5c28096da391885a53bdb855cd67c6a93fca
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spin-sites-for-coin-master-game-hack PDF link annotation
    • http://lib-smansumsel.sch.id/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/tiktok-free-view-quest_GM835599320.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-roblox_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_off00005105.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5105 24412 bytes
SHA-256: b115b955c0439fabfe8f056e0d42d8aaec2321b7852a64e85ebfbf8c713d05c7
font_01_sfnt_off0000893d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893D 17884 bytes
SHA-256: a210d42f6902d7d9d5bff07919c8107c405d033dd36282e8d99cfff98ec98e98

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