Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a594bfa04b83b7…

MALICIOUS

PDF

34.4 KB Created: 2021-06-18 06:03:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d2284b65216b0d0c2ddfd45e1ef765b4 SHA-1: a0f78033e73afeb8ec64f7edf3ade711dbca08ec SHA-256: 88a594bfa04b83b77a6eff3c74be0d908e296386439891355a2f9c2e2cda475f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous embedded URLs and a document body that mimics game-related content, aiming to trick users into downloading malicious files. The presence of a password-protected archive lure suggests the document is designed to bypass security filters by encrypting the actual payload. The ML classifier strongly flagged this PDF as malicious.

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-guest-shirt-free-2021-game-hack
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-today_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-gold-cards-for-coin-master_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/optifine-mcpe_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/earn-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/can-i-get-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-premium-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-100-free-spins-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-groups-to-join-numbers-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/download-cheat-roblox-jailbreak-for-pc_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-unlimited-fps-hack_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-co_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/make-your-own-minecraft-server-free_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-rules_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-admin-tab-on-roblox-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e72.bin
e8cd8a754ed62a841b5ad5a185c45dd822e571e325fc9d3d8be0051c7399b5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E72 22356 bytes
font_01_sfnt_off00005fe0.bin
4deed13048cd8f1a227a06d65a4b337c500867b14621a97cd5216b0140999673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 19580 bytes

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