Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bbd4370b226193…

MALICIOUS

PDF

40.7 KB Created: 2021-04-29 19:14:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6550d1322d17a09c49cc9494bdb141e9 SHA-1: 841a6b52c7fdffb043b17a82774bbb8d88fb8ef6 SHA-256: 98bbd4370b2261937a9a061822d993bf4dfe4ed8e56d592a284692b3fa82a7cf
82 Risk Score

Malware Insights

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

The PDF document contains embedded links and text that impersonate PayPal to lure users into clicking a link for a "Roblox Login Free Robux" generator. The primary malicious URL, https://netcdn.xyz/app/431946152/roblox-login-free-robux-game-hack, is presented as a call-to-action. The ML classifier strongly flagged this PDF as malicious, and the combination of brand impersonation and a suspicious URL indicates a credential phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/431946152/roblox-login-free-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.xyz/app/431946152/roblox-login-free-robux-game-hack PDF link annotation
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/como-hacer-hacks-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-how-to-get-free-hats.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/no-virus-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-booga-booga-hack-script-pastebin.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-cheat-codes-for-robux-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/bux-blast-earn-free-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-injector-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-edit-money-value-cheat-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/f3x-tools-hack-roblox.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_off000043b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43B1 24712 bytes
SHA-256: 855dddf5ec5fa6a5d579a456e59813019800186a3db377d724ab52ddaeeca3e1
font_01_sfnt_off00007cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBA 18496 bytes
SHA-256: 5f864e8109ce4d3ebe09839f7e7e0e82101f29267f4fbea8a1df1c5353a0beb2

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