Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852dbfdb71e3ecc…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 22:01:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e5196b2952f6aaec134defc0bab7f04f SHA-1: 8ca046a155b553c0d4091e7f4674311985fc9b61 SHA-256: 5852dbfdb71e3ecc13e0ded6812d40b36e09cf472590d601f2fb7974a67b6d01
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick users into interacting with it, likely to initiate a download or exploit. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead the user to a malicious site for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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/free-games-at-roblox-2-game-hack PDF link annotation
    • http://aks-akk.ac.id/html/perpusakk/repository/52-000-000-robux-free_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-robloxe_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-jake-paul-merch-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-robux-2021-wiki_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/robux-generator-free-no-download_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/tp-hacks-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-diamonds-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-in-to-builder-mans-acount-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/auto-speed-hack-legends-of-speed-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/greasyfork-free-robux-script_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/client-hack-roblox-2021-download_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-free-robux-2021-jefftech_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-hack-accounts-password-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/nopde-engine-64-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/wheel-decide-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-cbro-wall-hack_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-more-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-roblox-wings-not-decal_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_off00005541.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5541 25104 bytes
SHA-256: d3a76c0ad29b9f0fe2a4f4abfd7a91f65c55ccc91f79e1e656d4a167ee26d0b0
font_01_sfnt_off00008f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F22 18664 bytes
SHA-256: 3ce84ea88815a4d0bb43ae268a303d630183ac0a18bbd38d3a45f87975a4d9c6

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