Malicious PDF — malware analysis report

Static analysis result for SHA-256 847ba210f3592f8e…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 05:44:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9fa5494cc39b1c268930cf744fefad1c SHA-1: b8795aeb452d9d4befe75cbf652d29410a305603 SHA-256: 847ba210f3592f8ee05cfe707308abfdd92a7cfbda8a984a8a532eebac916ffc
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to lure the user into clicking a link, which is a common social engineering tactic. The embedded URL points to a site offering game cheats, reinforcing the lure. While no scripts were directly extracted, the PDF structure and ML classifier indicate malicious intent, likely involving exploitation or further payload delivery.

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.online/app/406889139/coin-master-daily-free-spins-link-app-download-game-hack PDF link annotation
    • https://perpustakaan.itda.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-apk_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-hacks-no-verification_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_off000051a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A1 24644 bytes
SHA-256: a5f214a1fe7f5420af6d73a8b65239c6b8a7174d195fecadf76a6c6efe76132a
font_01_sfnt_off00008a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A40 18816 bytes
SHA-256: b8b2cf79b84991169ffb18394fb1199612b1ccdb00c40184eec9f78d02156a2a

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