Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6edd6d54a3b5ed…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 09:44:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c78771e8eae762d9c6f031d2fc56dfbf SHA-1: 21f7dd525695105ee6b12cd547e53306682c6820 SHA-256: 3f6edd6d54a3b5ed01cc0c07252d772a0d4967bcdae826d6c5fc94597cfd89c8
122 Risk Score

Malware Insights

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

The document presents itself as a guide to hacking Roblox accounts, but contains a fake CAPTCHA lure to trick users into clicking malicious links. The presence of multiple URLs pointing to similar content suggests a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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/how-to-hack-someone PDF link annotation
    • http://unifieo.br/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/hack-master-coin-pc_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_003_off00004814.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4814 26216 bytes
SHA-256: 6f9d1d9d8cd9db31e30837644ce4ee0af0c58f9cd44e49b5c2d80cee097436c4
font_01_sfnt_off000085d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D5 19316 bytes
SHA-256: 0830f2bc2b032c7ad37be74462a8461862374830fa053aba1852b18e492c5f08

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