Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f30567b710f11f…

MALICIOUS

PDF

35.6 KB Created: 2021-06-27 02:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34038516496eee822bea8cb83e3f763d SHA-1: 12601b9bbee0dfe66b232004ff2b6de9b8014710 SHA-256: a0f30567b710f11f0a8eb674bbd02cb93b07fc7a5de8636d00a80c50c7bd2116
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are related to 'robux hacks' or game cheats, and displays a fake CAPTCHA to trick users. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution. The primary IOCs are the numerous URLs embedded within the document, which likely lead to malicious content or further infection stages.

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 http://netcdn.co/app/431946152/robux-hack-no-human-verification-needed-game-hack PDF link annotation
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-easy-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-tool-download-works_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-russian-flag-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/hack-for-all-games-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-obc-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-generator-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-crown_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34CA 21764 bytes
SHA-256: 3e15227343a9e1dae927edfe19aee0251634516bfddba5e4e5841554797db275
font_01_sfnt_off00006491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 19512 bytes
SHA-256: dbafc8bd2fd7d8ecec14e625e7e216be31f0c76c6579e31114c23d9dbf810617

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