Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada37e6167bfafb1…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 14:37:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 15ac73bfbca26ee025b75911289976b5 SHA-1: a242cdd815aba2bb22cffcdd7e9dc86eba5024c6 SHA-256: ada37e6167bfafb1699a6a8c0cf8257cd93e311fb84dbba30d63a519fddbb757
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking embedded links. The document body and heuristics indicate a focus on 'free Robux' or game-related lures, suggesting a phishing or scam attempt. The numerous external links, many pointing to PDF files with similar keywords, indicate a link farm designed to distribute further malicious content or lead to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/game-give-free-robux-game-hack
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/get-me-robux_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/download-hacked-games-coin-master_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-cards_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-cards-free-cards_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/roblox-hacks-for-mac_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-update-2021_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/free-roblox-intros_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/free-attacks-coin-master_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/how-to-use-redstone_GM479516143.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/blogspot-coin-master-spins_GM406889139.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://elearning.man1sintang.sch.id/__statics/gudangsoal/files/coin-master-hack-tuts_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004991.bin
dbd1668ce39c3d3e2ce6f2c98dd1b05eb6498b84247c7eddb5effe9cd54dc158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4991 25008 bytes
font_01_sfnt_off00008351.bin
457049c0c0b067ea8a2ccaf5c24f39a354f8c872058b648fa686429afe9091ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 18736 bytes

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