Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39c9db6d40c545a…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 00:14:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba46c6924f7bc117064f6293dbef733e SHA-1: 935c50bb7b6ac373409d0b3e33cf0a893adfb2ab SHA-256: b39c9db6d40c545ae0bc91353c06f0294a66733ee6c7c7addf4d2629d6f66948
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a "call-to-action" phrase, strongly suggesting a phishing or scam attempt to trick users into downloading malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of many external links and the document's structure indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/dominos-hat-roblox-for-free-game-hack PDF link annotation
    • http://pustaka.fk.unand.ac.id/repository/robux-hack-thumbnail-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/working-2021-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-roblox-accounts-girl_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-generator-no-survey-youtube_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-make-a-roblox-aimbot-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/roblox-tix-robux-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/get-free-robux-gamepasses-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/stickmasterluke-free-robux-obbys-link_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/hack-robux-ios-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-get-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/how-to-hack-murder-mystery-2-on-roblox-with-nopdengine_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/2021-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fk.unand.ac.id/repository/descargar-roblox-hackeado-para-android-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_off0000323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323D 22168 bytes
SHA-256: 53be37785706398157f2a7fbc96e08bd44521e972f1b3487c2201fe693e6ff9c
font_01_sfnt_off00006389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 19304 bytes
SHA-256: 144fb8ba0601f953ebe4e47144afbde722a79edc920945f425712e97e82658b5

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