Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f21b63255f4cbb…

MALICIOUS

PDF

44.5 KB Created: 2021-06-08 17:13:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d6af2a06b5f893080f0d3c19952026e SHA-1: c0290aacc7b89449ad72e82f88aa4f424587df1d SHA-256: 40f21b63255f4cbbff6b433708ef617b04b5dfc596497b156bc2a04dfc000df5
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, encouraging users to click on embedded links. These links, such as 'https://netcdn.tw/app/431946152/roblox-account-been-hacked-game-hack', likely lead to malicious content or scams. The presence of a large number of external links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful websites.

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.tw/app/431946152/roblox-account-been-hacked-game-hack PDF link annotation
    • http://library.stikessuakainsan.ac.id//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/filtered-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-robux-hack-generator_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_off000050c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C1 25364 bytes
SHA-256: 6da884e2fa12f887a4f6f20844e80f660ff65e108fea74b66717fa8764d0e6ce
font_01_sfnt_off00008a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1E 18600 bytes
SHA-256: 41317b0e55240602705b6bfcb5ad03c9a4f3b22f98ee9b08e2ed41d496bfb991

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