Malicious PDF — malware analysis report

Static analysis result for SHA-256 f394c3fe1e7f4103…

MALICIOUS

PDF

35.2 KB Created: 2021-06-18 10:06:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d3484d8397ffe9d87a0af29ff8a9c1ce SHA-1: 1dd6775ea3d3f343b687a442e934021b19a85998 SHA-256: f394c3fe1e7f4103b1de7cc1b19a81cb6b508c673536d1e8dc8d136eb68e05b9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure related to free in-game currency ('Robux') and includes multiple embedded URLs pointing to similar content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack, potentially involving encrypted payloads. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/show-me-how-to-get-free-robux-on-roblox-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/como-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-alts-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-card-pin-hack_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_off000031c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C9 22436 bytes
SHA-256: aa8743be53d03f3989729b7ec94084d189e3b27b4544618b662edce5d20119cb
font_01_sfnt_off00006386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 19420 bytes
SHA-256: 7d77ef90c42c984f33f0cd4d10b67e2f97576dda3a2d6db4b0f4bc55830bac65

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