Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3dda424d512dc2…

MALICIOUS

PDF

44.3 KB Created: 2021-06-11 10:23:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d18e79522581b0307a1c3919552dce98 SHA-1: 21df14916d998bc10d72b2d1c9eb0c94392e24c0 SHA-256: 1f3dda424d512dc2d8be6ed218b025cd110f62807f25e96000d9d132d3cd50da
82 Risk Score

Malware Insights

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

The sample presents a fake CAPTCHA or human verification prompt to trick users into downloading further malicious content. The embedded URLs and document body content strongly suggest a lure related to game hacks and cheats, likely leading to malware or unwanted software. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/unjailbreak-hack-roblox-descargar-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/roblox-scripts-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-hack-net_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-cat-hacked_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/counter-blox-roblox-offensive-exploit-hacks-by-autumn_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-studio-free-online_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/fre-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-free-account_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-hack-easy-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/follow-people-inyo-roblox-games-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/flames-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-ro-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-picture-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hacked-version-download-apk_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-phone-number_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/infinity-gauntlet-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-bighead-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-on-a-ipad-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-coloring-sheets-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/get-free-stuff-on-roblox-2021_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_off000050e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E1 24276 bytes
SHA-256: 5a2e2d28112ff34b78d85648b27e6fe3abe2b035df620c2cb3a1605be1f67612
font_01_sfnt_off00008801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 19132 bytes
SHA-256: 842057aa3784f09be8f9ff3d595580628497cd63c50df8f617a14185922e6e8b

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