Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1c72f33232bb1e…

MALICIOUS

PDF

48.7 KB Created: 2021-06-04 02:28:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a27fba986bedb3fbf83216cc36bfd553 SHA-1: 59d21979e38ea63b9a34d0a8b7b94daf3fdb48ef SHA-256: dd1c72f33232bb1e6260e8d2d6a2185a195a294d231f1e8e455c3a549fb37012
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body promoting 'Free Robux' and other game-related lures, indicating a phishing or scam attempt. The presence of a PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger network designed to drive traffic to malicious sites. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/free-robux-microsoft-game-hack
    • http://perpustakaan.dutadharma.ac.id/repository/robux-com-free_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-co_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-com-real_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-2021-robux_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-app-android-download_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/rbxdemon_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/como-hackear-coin-master-ios_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/get-free-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005491.bin
3a14fdefb7671a9a91a3e1fbec90acc32185c5805d81a982a90e7fa7b8e9789b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5491 27064 bytes
font_01_sfnt_off00009162.bin
d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9162 2844 bytes
font_02_sfnt_off00009b22.bin
753f3f2a839cbba740b1165c82973d17105d10f1d8ffbf22e8371d7b58d196dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B22 18436 bytes

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