Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f88f6367edf16d…

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 10:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1dfd27aafb359813648c9e5ed8832bde SHA-1: 612fe9346cc12b4dc0072f9ab7e85a2e69d24bbe SHA-256: 99f88f6367edf16dec970aac63827a83a9ed9cfb5ba89d1a76ff0240eea21567
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a document body that attempts to lure users with promises of game cheats and free in-game currency. The heuristic firings indicate a high likelihood of malicious intent, specifically related to linking to external content and potentially exploiting users. The ML classifier strongly supports this assessment.

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/cheat-roblox-menu-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cerberus-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/como-tener-robux-gratis-sin-hacks-facil-y-rapido_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacks-for-roblox-script_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-macbook-pro_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/fill-in-form-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-promo-codes-thumbnaill_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/rbxnow-gg-get-free-robux-on-roblox-playing-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/script-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-2021-download_GM406889139.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_off00003272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3272 22684 bytes
SHA-256: a5afece3442fdc052e8e75e76fa238cc6ab0310b3c8172df64f8dae7fced3d25
font_01_sfnt_off00006510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6510 19092 bytes
SHA-256: 0302068f1e2f732786e55299f0d6f195314f3fe14544d6c5cde5840926e4d2f3

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