Malicious PDF — malware analysis report

Static analysis result for SHA-256 923c998981e3aa2a…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 22:51:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 60d4a51dd4b7689dd51019e06fe6aef3 SHA-1: 2251fc21b0cc5e1edbd029545200239501f58a62 SHA-256: 923c998981e3aa2aecb1f4869218fe300bfa19387c72663c7eacfce031ab7e77
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains an external URI pointing to a URL that appears to be related to game hacks or cheats, suggesting a lure for malicious downloads or redirects. The ML classifier also flagged this PDF as malicious with high confidence.

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.online/app/406889139/300-daily-free-spins-coin-master-game-hack PDF link annotation
    • https://perpustakaan.urindo.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-hack-coin-master-cheat-engine_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_off0000531f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x531F 26204 bytes
SHA-256: 5f95e83db43f80aa62b8b52388eae39f7a240434726b933ad5aac1b5000f7208
font_01_sfnt_off00008e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E26 18656 bytes
SHA-256: 54868513bfe31238ae3395f8478781089c68907253390a8344cb056fc0e1040c

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