Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d8a0e9198be04f…

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 21:07:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b09ec58af702ee14c079cb648dc32bd4 SHA-1: de91ba76d510ceace868dc2622d78422b4968d00 SHA-256: 98d8a0e9198be04ff71aa417c31dc0b59be4f2ddce3c8b5d86e591f9323ce303
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that attempts to lure users into downloading potentially malicious files by promising free in-game currency or accounts. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to download a second-stage payload. The heuristic for a password-protected archive lure suggests the downloaded content may be encrypted.

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/roblox-smoking-free-game-hack PDF link annotation
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-codes-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/can-i-please-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-itrems_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_off000030a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 22924 bytes
SHA-256: 6550f8edcbe923e0bb731359f95a7ca6ffb543441759f7b8bb79f5f37d9fc360
font_01_sfnt_off00006412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6412 19200 bytes
SHA-256: adbd72198ef97c10e3ddf68f99d3d2a6f5ba2a3fd5ace8a852092a54f5f88fa7

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