Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4336a020e23acd…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 10:04:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abd2131ddbd07678bd3399ff744391c5 SHA-1: 528091681f4ca6d8ab599902b01159cfb5826046 SHA-256: 6f4336a020e23acdeed49c31ff7bebdc8faa796ebe811073897f3b736e02dee0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a prominent call-to-action related to obtaining free Robux for Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the URL http://netcdn.co/app/431946152/get-robux-free-in-roblox-game-hack, which is likely the destination for the promised download.

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/get-robux-free-in-roblox-game-hack
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-robux-no-hack-no-survey_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-get-free-cash-in-boku-no-roblox_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/all-the-roblox-redeem-cards-in-the-world-for-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/can-you-hack-roblox-with-cheat-engine_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/pubg-700-site_GM1330123889.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-cheat-in-roblox-ninja-legends_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/cheat-stand-online-roblox_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/tiktok-free-textbooks_GM835599320.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/what-am-i-drawing-roblox-cheat_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-hacking_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/island-royale-roblox-hacks-2021_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/roblox-t-shirt-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/coin-master-time-hack-ios_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031c1.bin
907fbd00e468eda7b9926ba8d88e6262fc40f8e27c860aa50f2e454902187eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31C1 21440 bytes
font_01_sfnt_off000060d6.bin
4fd5d5a9aa7656a5ba0744733b2196b5e5b161cd84f19bd1fd3533d341f7f5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D6 18896 bytes

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