Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c88d46cc1696e9a…

MALICIOUS

PDF

35.4 KB Created: 2021-06-25 22:07:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8da45c9260a0d934571d2c3537bfe856 SHA-1: 7ca2858e87b02a4e078db931d5dada16db05552d SHA-256: 2c88d46cc1696e9a59b8bc346c780dc518d4e7b882e444ac0682aa029fb7b35f
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a document body that mimics a download lure for free in-game currency, strongly suggesting a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely to further phishing or malware distribution sites. The ML_NYX_PDF_MALICIOUS model also flagged this file with high confidence.

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/how-to-get-free-robux-tablet-easy-2021-game-hack
    • http://library.acehresearch.org/repository/how-to-hack-accoutns-on-roblox_GM431946152.pdf
    • http://library.acehresearch.org/repository/how-to-get-free-robux-easy-and-no-generators_GM431946152.pdf
    • http://library.acehresearch.org/repository/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-spin-coin-master-game_GM406889139.pdf
    • http://library.acehresearch.org/repository/check-cashed-v5-roblox-hacks_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-robux-2021_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-coin-master-cards_GM406889139.pdf
    • http://library.acehresearch.org/repository/real-coin-master-free-spins_GM406889139.pdf
    • http://library.acehresearch.org/repository/free-spin-link-for-coin-master_GM406889139.pdf
    • http://library.acehresearch.org/repository/minecraft-cheats-switch_GM479516143.pdf
    • http://library.acehresearch.org/repository/coin-master-hack-game-download-ios_GM406889139.pdf
    • http://library.acehresearch.org/repository/free-robux-sites-2021_GM431946152.pdf
    • http://library.acehresearch.org/repository/minecraft-hack-app_GM479516143.pdf
    • http://library.acehresearch.org/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://library.acehresearch.org/repository/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • http://library.acehresearch.org/repository/free-robux-with-synapse_GM431946152.pdf
    • http://library.acehresearch.org/repository/minecraft-free_GM479516143.pdf
    • http://library.acehresearch.org/repository/free-roblox-gift-card-codes-2021-not-used_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-hacks-for-coin-master_GM406889139.pdf
    • http://library.acehresearch.org/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030c1.bin
77631e5800ab334c5e73de648a7664d92b9dc17373c8031057bdfb46c6293260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30C1 22624 bytes
font_01_sfnt_off00006371.bin
9c508ded8b317ed817c6d6a036a183965d7eac8109c821d913377604673e3555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 19640 bytes

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