Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdedb561126b1e4…

MALICIOUS

PDF

33.5 KB Created: 2021-06-20 13:14:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: af55cd8b5d1c330f77d242c4d97e76ca SHA-1: 02006c7cadb7f8f118bd49a4a972f478e3d7926a SHA-256: bfdedb561126b1e49b1f2a2f9df379fee80c2677bb33beff4723b375a9234b9f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to various websites offering game cheats and free items. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

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/exo PDF link annotation
    • http://krumerhaus.at/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-apk-mod-unlimited-robux-free-download_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/wurst-112_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/robux-hack-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-admin-commands-on-any-game-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-kozak_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-boxing-simulator-2-cheat_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-help-free-robux_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_off00002d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D95 22200 bytes
SHA-256: 897ca1517ece588338527f91521f166222b65b85e4266b3d51f428e4587f8e65
font_01_sfnt_off00005e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E81 18820 bytes
SHA-256: 023ee8fa22f5c5288127bfc84b122139244818b6fc697e4cbdcf12c109d67938

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