Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa5a70cdb44c753…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 14:29:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c9bfa616db08fb0b8dc06400baa4aace SHA-1: eaa239a85666cd0e6b2df47fe5823710cc24ffdb SHA-256: 8aa5a70cdb44c7530a5b9b3901cf6e6e02ce62575dbf7dc375bea646a2d99ac0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document presents a fake CAPTCHA or human verification prompt to trick users into downloading content from external URLs. The presence of numerous SEO-optimized PDF links suggests a link farm designed to drive traffic to potentially malicious download sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/406889139/hack-coin-master-3.2-mod-apk-game-hack
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-links-for-today_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-account_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-gold-cards-coin-master_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/minecraft-java-edition-key-free_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/minecraft-ps4-free_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spins-links-2021_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-discord-servers_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/roblox-hack-client_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/minecraft-ios-mods_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-download-pc_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/websites-to-get-free-robux_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spin-link-daily_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/minecraft-coins-free_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a71.bin
a2e2b524444d7de12bf230a6cba2b7ea8a91818f4409d37a209d4b8afb327b4e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A71 24524 bytes
font_01_sfnt_off000082ff.bin
079b3165dd07087070801d60b3a3bfa244d98e21bcbdfb300c485c1ab1e92bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FF 18428 bytes

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