Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4718c9e0b1bdbd…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 14:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cad9a8e1468fb2af969d5fef5e05039 SHA-1: 9087150281a410c7442883486fa9c4018cdd4414 SHA-256: ba4718c9e0b1bdbd3b24cbe206831108b3c3a407b029cdb6bf90481f40e4faf3
82 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.xyz/app/406889139/guide-:-coin-master-free-tips-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.xyz/app/406889139/guide-:-coin-master-free-tips-game-hack PDF link annotation
    • http://calavera.be/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/rbx-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/minecraft-menu_GM479516143.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_003_off00004a55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A55 25072 bytes
SHA-256: 0e61385d7ba5be9c37cd0cac915a4003738553eeb02b72dbceaa94e92be0e280
font_01_sfnt_off0000842c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842C 18200 bytes
SHA-256: fdfacab2d625470a4d3b5479a82a6c826f513179de74355829789051bdf7e838

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