Malicious PDF — malware analysis report

Static analysis result for SHA-256 285169e3faa98b1a…

MALICIOUS

PDF

34.5 KB Created: 2021-06-26 09:54:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4216dbd10575fd455913d1ee41b236e SHA-1: 3d8b01b79de9f896ec427b0fe63fceb5621b68d9 SHA-256: 285169e3faa98b1ab7ef40e59a8b5d4361107949dbeeb4e5163dba37bece276f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs pointing to external resources. The document body and extracted URLs suggest a lure related to 'free Robux' or similar gaming-related scams, likely intended to direct users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/dhow-do-get-free-robux-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-points_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/get-free-robux-on-roblox-app_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-phantom-forces-free-robux-bot_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-admin-roblox-how-to-turn-itto-others_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-hack-no-human-verification-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-roblox-cbro-download_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-coin-master-game-apk-download_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_off00003176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3176 21688 bytes
SHA-256: 8c0cdeb1347d2a2045b6d291d0659dfe2963afaa9bdfb47cb8b444ae8a723fee
font_01_sfnt_off00006112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 19320 bytes
SHA-256: 7433b3857f07a27617c7f54ff2df7732f1d8bb7505d3c6bf6b1808945c6b3df6

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