Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8719e85d84aa41b…

MALICIOUS

PDF

34.6 KB Created: 2021-06-29 13:59:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 836adb4fa8024ea7d32c5f8cd026fe40 SHA-1: 24939a934e56860aba2220aca13729c75e206af7 SHA-256: f8719e85d84aa41bd85f48ce5cebc72bbdeb3e9837cedd278113aad8b4a32d03
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a link farm of SEO-optimized PDFs and a call-to-action button to entice users to download content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful sites or downloads. No scripts were extracted from this sample.

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/roblox-adidas-hoodie-free-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/hack-para-destruir-en-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pubg-50-uc_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-para-canbiare-el-nombre-en-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pokemon-go-free-joystick-android_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-you-get-the-ability-to-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-not-fake-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-800-robux-for-free_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_off0000308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308D 22424 bytes
SHA-256: 3da4a0a24e3674b42a9e272b2c82e384afe74012d3ab8d7b82197659082da000
font_01_sfnt_off00006260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 18944 bytes
SHA-256: 4bb3f2e7dd17b3ba3fac0200ea6cf754230e08b42f3b52ac79ff5025c1f921fe

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