Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b0ac57b0da40e3…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 11:34:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb948e2309e0ea6cb505393a405e64c9 SHA-1: 5028a38a08a19aae53cb9d4f80aed9cfbb5f3eb6 SHA-256: 93b0ac57b0da40e387b66f1ee250e0152ac262a964dcd2dbe3dab81792cb4f48
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick the user into downloading a malicious file from an external URL. The document body and extracted URLs suggest a theme of game hacking or cheats, likely to entice users. No scripts were extracted, but the presence of a malicious URI and the fake CAPTCHA heuristic strongly indicate a social engineering attack.

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/roblox-big-head-hack-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-cheat-engine-commands_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-by-inspecting_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/pokemon-go-free-7km-eggs-august-2021_GM1094591345.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/download-the-free-robux-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-2021_GM406889139.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_off00005308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5308 26008 bytes
SHA-256: 390a547281cd61d0bbf87bb7930b30ea7101927dd364a956263caaa5ee8585b5
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 18764 bytes
SHA-256: 08f0f79e31398186ec6ace3210ebef8d5642fabc5b70809016438b2f1bce4c44

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