Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae855bf8897fa95…

MALICIOUS

PDF

34.1 KB Created: 2021-06-19 03:07:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 960c82927fbea462ea7aa574fc629e8c SHA-1: d3e8621af32d4bfee9a0caeea59c05575a489dbe SHA-256: 5ae855bf8897fa95df0dc89736a27df2c71faca4f79b1e72d968edde1e3d0439
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, identified by the PDF_SEO_LINK_FARM heuristic, that lead to websites offering game cheats and virtual currency. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The document body and extracted URLs suggest a lure for users seeking in-game advantages, likely to download malware or unwanted applications.

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/robloxs-cheats-hack-os-android-robux-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-dance-your-blox-off-cheats-to-get-points_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spin-links-coin-master-october-30-2021_GM406889139.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_off00002fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC2 21688 bytes
SHA-256: b8de8a82b68813e317353be73c870fc663fae51c234b0e6c26bbf294ffe224b1
font_01_sfnt_off00005f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F75 19360 bytes
SHA-256: c3b6a19cd03cb6720c8f5409a65f1344da4b1ceba4040437d502ca2aa9bf45cb

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