Malicious PDF — malware analysis report

Static analysis result for SHA-256 646594cf5f4a55d6…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 12:53:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6808bffaad4916b7b257c5d2db4a3ed4 SHA-1: 90f8e997e6d7cba0c6c9fdaf29abd7df6b0b0ada SHA-256: 646594cf5f4a55d6040816dcf7f73cd767abfe42375cad14d9a6b35d3f5f7394
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as a link farm for SEO purposes, all related to obtaining free Robux or game hacks. The presence of a call-to-action button and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/i-will-hack-you-roblox-audio-game-hack
    • http://library.atim.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • http://library.atim.ac.id/repository/robux-generator-com_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-magic-training-wand-free_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-no-survey-no-downloading-apps_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-please_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-daethrun-hollowenn-update-cheat_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-vietnam-2021-aimbot-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/hacks-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-link-app_GM406889139.pdf
    • http://library.atim.ac.id/repository/hack-jailbreak-roblox-2021-cranberry_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-download-gui-roblox-twisted-murder_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdf
    • http://library.atim.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://library.atim.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-website-that-works-no-generator_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-spins-on-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-robux-app-real_GM431946152.pdf
    • http://library.atim.ac.id/repository/flamingo-free-draw-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005637.bin
4239341f06922850ed6bb035321798dce4c1ede0150bea95223f3d49e63cdb3b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5637 27968 bytes
font_01_sfnt_off000097a2.bin
18c7b72cfec12e938d7eb8ae53db0f5cb1aeb8e7bfeeb26376fb147517d6253d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A2 18976 bytes

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