Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e04fcaa4f2c157…

MALICIOUS

PDF

45.0 KB Created: 2021-06-04 05:06:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8fd90cac34580101315ad346c644c9b0 SHA-1: e1847d737ac9de5879b347c8ce9a62e82885a1cd SHA-256: 72e04fcaa4f2c157dc338c7a65eb42d4e2c5e0df148cff4d6f337d172e3e02aa
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and impersonates Microsoft to trick users into clicking a malicious link. The link leads to a download for what appears to be a game hack, which is likely a malicious application. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/roblox-apk-hack-robux-game-hack.
  • 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/431946152/roblox-apk-hack-robux-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-please_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
font_00_sfnt_off00004f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F51 26552 bytes
SHA-256: 163ba60299a732d4b4e961abb7a2c7fa854fbf4bd76e5f8f13f3633ac484d31c
font_01_sfnt_off00008ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA6 18500 bytes
SHA-256: 935d3280389938c65d2521acbdefd0c6dde21bc0b0479bfbaabebf347501b691

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