Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f0cfae82b46080…

MALICIOUS

PDF

43.7 KB Created: 2021-06-11 05:40:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 09428938635a1b215ed4d9ca2287b920 SHA-1: 3ec111ad630e316cdee742d80a1f023c65eac278 SHA-256: b7f0cfae82b46080d8d6cb960d438e7a381571da7a0eb896fc4fdde5d3b54790
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various websites offering free in-game currency and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-free-rthros-game-hack
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-survey-2021-working-august_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-roblox-cards-pin-number-2021_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/rblx-city-free-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/i-want-free-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/pokemon-go-free-daily-remote-pass_GM1094591345.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/www-blox-land-free-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-zombie-animation-for-free-roblox_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/static-moonactive-net-free-spins_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/by-pubg-uc_GM1330123889.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f0f.bin
36ba8ee21a09b83c294aabdd6e175c1c1e79198ef0d28513e0f2310c0ee8dfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0F 24932 bytes
font_01_sfnt_off0000884f.bin
c8a497331763b53562cd7a98030434fad30984c156639544f97fb6899e15a1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 18216 bytes

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