Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c76ce9cab0b7d36…

MALICIOUS

PDF

43.2 KB Created: 2021-06-04 03:59:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cda4397c5e4f51bc6e0eb1e747b9a395 SHA-1: 5ff2cc42b13817137ba0bca090f54c4291eb0ee0 SHA-256: 6c76ce9cab0b7d367224b686146546730a19294feeb85d6b8da2f3fbb550b306
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are presented as "free Robux" or "Coin Master" hacks. The presence of a "Fake CAPTCHA / human verification prompt" heuristic indicates the document is designed to trick users into completing verification steps, which typically leads to the download of additional malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/android-coin-master-hack-game-hack PDF link annotation
    • http://oca.undil.tl/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-app_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
stream_004_off00004f93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F93 24188 bytes
SHA-256: 93ba5ac1a1dafb24cc4c711c9e7294e88705d40b2f2266ef4f1d2dbcae97a8e1
font_01_sfnt_off00008716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8716 17888 bytes
SHA-256: f3c500806d6f063b4976708b2d9a1b6d3d25ac0b83d617d4d708477778ab7703

Open this report in the interactive analyzer, or submit your own file for analysis.