Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1f81dd385546aa…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 16:50:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8a160f7f459dc15f66c48a1990a6f33e SHA-1: 908ed8711b5769a75fabf23fa5337696f8180786 SHA-256: 9e1f81dd385546aa38dda80e3017e37eebf1142b1a7454b9f3005da1cf9f7665
122 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and impersonates Microsoft to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-august-2021-game-hack, is presented as a lure for hacking Roblox accounts. While no scripts were extracted, the document's structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-august-2021-game-hack.
  • 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/how-to-hack-roblox-accounts-august-2021-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-tiktok-hands-free_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-roblox-chat_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F6 26428 bytes
SHA-256: 613a7490e9ab0724b0c7259b392560fbe27c56c83408adfe8b6b6ae8caf05ee8
font_01_sfnt_off00008be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE7 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_02_sfnt_off000095f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F8 19280 bytes
SHA-256: f4431d3144cbb870d31788535e8cec37eaeb9f72186f8e4cddfdfb54c3d24a1a

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