Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d79b8d07812f195…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 21:59:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aed6da13893b3e94e8da1709e1604075 SHA-1: 9252bfc9c098f9455352608c44621cbf29c4f90e SHA-256: 9d79b8d07812f1956da205df1ebd94576f87f9a753870e20bad8629224f7ee30
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content-scraping operation. The primary URL, http://netcdn.tw/app/431946152/roebucks-on-roblox-game-hack, and the numerous other PDF links indicate a campaign to distribute potentially malicious files disguised as game hacks or generators. 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.tw/app/431946152/roebucks-on-roblox-game-hack
    • https://fib.ub.ac.id/sac//repository/roblox-hack-generator_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-without-verification_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/toolbox-apk_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/pokeballs-in-pokemon-go-free_GM1094591345.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-robux-hacks-download_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/games-to-get-free-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/wwwfreerobuxgenoratercom_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-without-survey_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-no-human-verify_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-hack-tower-of-hell-in-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-get-minecraft-coins-for-free_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-robux-for-free-without-cheating-or-hacking_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-sue-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/hack-cheat-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-stuff-on-roblox-pastebin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032cf.bin
191befe1c1d9c1308a3c6b4fcd762695b00b393dd89ce263ef1ccf1bab1079f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32CF 22800 bytes
font_01_sfnt_off000065e3.bin
58d0b4866d64dafe4f5ce9b57e76ffce2d11e44b7407c5bc7b475816988fb519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 18796 bytes

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