Malicious PDF — malware analysis report

Static analysis result for SHA-256 844f0f3adb9aeb19…

MALICIOUS

PDF

35.6 KB Created: 2021-06-28 00:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 336a5cb3500a90775ec79d496bcd250d SHA-1: 97ce0024e37a162cef9ab37aeaa69d5db0d62e58 SHA-256: 844f0f3adb9aeb199923da1663f0742e7b23a426c3b0e11fe2fcdd38dd737ad5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that lead to pages promising hacks and free currency for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

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/hack-account-roblox-edit-this-cookies-2021-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/can-you-be-hacked-by-an-id-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-1-million-robux-for-free-really-easy_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-via-group_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/earn-free-robux-vrobux-com_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-iphone-5_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/i-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-eu5_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-make-free-clothing-to-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/egg-farm-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/assleech-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/a-hack-for-roblox-tower-defence_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-make-a-roblox-skid-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_off00003267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3267 22364 bytes
SHA-256: b7cfa89fbfd543d594bbbfffada841e9906b57b03f875279072568467eda538f
font_01_sfnt_off000063f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 19764 bytes
SHA-256: 45251ad878e163b779addd23df1c385f20a13bfd2ce20a8b1fa0db4a26f13730

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