Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e2c2b7b97f259e…

MALICIOUS

PDF

35.6 KB Created: 2021-06-29 05:55:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4b176fd81ce9533786a0fc4c9edef95c SHA-1: c94f21ee82bab6447e9b9334185e1f7e3348ab81 SHA-256: 21e2c2b7b97f259e442d605a357cafb0e1b5f9f0e5de97ef9d9d912c51ebcf96
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering free Robux or game hacks. The document body explicitly mentions 'Free Robux No Human Verifivation No Survey' and includes a URL that likely leads to a malicious download or phishing page. The ML classifier also strongly indicated maliciousness.

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/free-robux-no-human-verifivation-no-survey-game-hack
    • http://lib.stimykpn.ac.id//repository/links-to-free-spins-on-coin-master_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/how-do-you-get-robux-for-free-2021_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-hack-games-in-roblox-on-ios_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/roblox-character-edit-hack_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-roblox-account_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-get-robux-for-free-code_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/free-robux-thumbnail_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/roblox-guest-shirt-free_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://lib.stimykpn.ac.id/repository/what-player-got-banned-for-using-free-models-roblox_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/free-robux-simple-easy_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-coins-in-coin-master-game_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/can-you-hack-peoples-roblox-credit_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/free-robux-no-download_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021_GM406889139.pdf
    • http://lib.stimykpn.ac.id/repository/lyce-de-roblox-2-hack-directeur_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/op-rewards-free-robux_GM431946152.pdf
    • http://lib.stimykpn.ac.id/repository/generator-free-robux-facil_GM431946152.pdf
    • http://lib.stimykpn.ac.id//repository/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003138.bin
16b058a893544731f9ee5ad44a3b53d204d27afcd6bef01195dcea303e05f74d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 22860 bytes
font_01_sfnt_off0000646d.bin
fbbc372b10e3538629c398ca6ed107187a7ebbb96c831b0b19a1d3354e73d24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 19628 bytes

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