Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eeebb852fb7967e…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 13:33:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 169c2668fc1bea8b79ea576dad192093 SHA-1: e3c567c42a10bb0610cd03e118ef8cf0c2cec976 SHA-256: 8eeebb852fb7967e23fefc85217555359ff1d86cb87fca14efdd0b494a2f181b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a link farm heuristic indicates a large number of external links, suggesting a tactic to drive traffic to other sites. The ML classifier also flagged this PDF as malicious. The presence of a download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-got-talent-piano-hack-game-hack
    • http://unifieo.br/images/coin-master-free-link-2021_GM406889139.pdf
    • http://unifieo.br/images/how-to-coin-master-hack_GM406889139.pdf
    • http://unifieo.br/images/how-to-get-real-robux_GM431946152.pdf
    • http://unifieo.br/images/coin-master-free-spins-and-coins-group_GM406889139.pdf
    • http://unifieo.br/images/earn-robux-sites_GM431946152.pdf
    • http://unifieo.br/images/hack-the-coin-master-game_GM406889139.pdf
    • http://unifieo.br/images/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://unifieo.br/images/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://unifieo.br/images/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://unifieo.br/images/coin-master-hack-ios-10_GM406889139.pdf
    • http://unifieo.br/images/free-spins-from-coin-master_GM406889139.pdf
    • http://unifieo.br/images/free-limiteds-roblox_GM431946152.pdf
    • http://unifieo.br/images/robux-gratis_GM431946152.pdf
    • http://unifieo.br/images/free-robux-pins_GM431946152.pdf
    • http://unifieo.br/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • http://unifieo.br/images/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://unifieo.br/images/jailbreak-roblox-hack_GM431946152.pdf
    • http://unifieo.br/images/free-spins-coin-master-cheats_GM406889139.pdf
    • http://unifieo.br/images/roblox-avatar-free_GM431946152.pdf
    • http://unifieo.br/images/games-that-give-you-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000489d.bin
1653a989cf045e52abd7baf1cd82a60cf00a0211c6007d5c797bc31720e75aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x489D 24544 bytes
font_01_sfnt_off0000807b.bin
718cc2b062ab6cfaeb2a411bf3639d4ddcb64813a44b35fc4dc4c297fc3c3153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807B 18560 bytes

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