Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a860baa6394f4a…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 15:17:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a2584bb8bba5dfa506eca7952bbe3fc SHA-1: 1a0034dd85ec30ad7f6122fb9892976d3ccca5d3 SHA-256: 20a860baa6394f4a4a0390f2773bd3df19d4b53ef4ba659a758d1e4af7276b2c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and numerous external links, indicating an attempt to trick the user into visiting malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests a broad phishing or scam campaign. The document's content, including the URL 'https://netcdn.xyz/app/431946152/tryrbx-site-free-robux-game-hack', points towards a lure related to free game currency or accounts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/tryrbx-site-free-robux-game-hack PDF link annotation
    • http://repository.poltekkesjakarta3.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/robux-come_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/game-toolbox_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC0 27996 bytes
SHA-256: b4d97dddd9a85b916398f6d614286446ec49998fedf5846cf7548a6652072201
font_01_sfnt_off00008bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF1 18420 bytes
SHA-256: c05555d4ecf6fda64d59e10aa7bbdccb6b0b8342b7e9a04540fdd3a1ca0e8435

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