Malicious PDF — malware analysis report

Static analysis result for SHA-256 7427599b4b2e8335…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 09:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3ab0f087c3e10b7bf9bdacd2deec7854 SHA-1: ffb27af9fa0acde326377ed24952c5c4e8438919 SHA-256: 7427599b4b2e8335c5e344e926d97a7866dd16a29b310ab12a2cbb915e2bd1b1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to appear as search engine results for game hacks and cheats. The primary URL http://netcdn.tw/app/406889139/feb-23-2021-free-coin-master-spins-game-hack is likely a landing page for a phishing or malware distribution campaign. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a deliberate attempt to mislead users.

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/406889139/feb-23-2021-free-coin-master-spins-game-hack
    • http://perpus.masda.ac.id/repository/flamethrower-hack-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/easy-way-to-get-free-robux_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/roblox-shirt-template-free_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/roblox-shirt-are-now-free_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/aimbot-hack-roblox-assassin_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/roblox-how-to-sell-t-shirts-for-free-reddit_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdf
    • http://perpus.masda.ac.id/repository/joedaddy-free-robux_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/coin-master-hack-no-survey-2021_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdf
    • http://perpus.masda.ac.id//repository/coin-master-cards-free-cards_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/how-to-get-free-infinite-robux-in-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/hack-desert-treasure-quest-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/free-robux-generator-2021-no-human-vrification_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-uk_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326d.bin
f47bc3d5ed5e4cbd6e2d89f15ea5abe1e7281b47de83cc0a436a7e560d55a228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x326D 23380 bytes
font_01_sfnt_off0000674c.bin
e0771b50d1ff1da3616b18720609509c0408d969f90d2ca56c6ff943279e16bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 18908 bytes

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