Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9c2bea2e690bcc…

MALICIOUS

PDF

42.9 KB Created: 2021-06-04 00:39:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a86b42fe1e9870e7f871991407e072b1 SHA-1: eeff3e550b1cc9a7c63b0adc04dfb39a2b1c0b76 SHA-256: 4b9c2bea2e690bcc4db3597860988d7ec08d9cc99f230cc10317dc74df2b5770
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 clicking a link. The primary link identified, 'https://netcdn.online/app/406889139/hack-the-coin-master-game-game-hack', is likely intended to lead to a malicious download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/hack-the-coin-master-game-game-hack PDF link annotation
    • https://library.stikesmi.ac.id/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/rbx-website_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/get-roblox-items-free-chrome-addon_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-tiktok-engagement-calculator_GM835599320.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_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_off00004dd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD3 24336 bytes
SHA-256: 6a562699653c0ad8f257ac2f7d877fea265662a2feb03ad59d28c40d15dbc110
font_01_sfnt_off0000858f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858F 18144 bytes
SHA-256: aa7008f7bc0d98fcc59006e96c258827ac3c6afac5e69ad5098b3c76289d630e

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