Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ce16bf25249274…

MALICIOUS

PDF

45.0 KB Created: 2021-06-02 18:14:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 816aca3407e04c4821f7eca66e3d5d07 SHA-1: 85edc7474b022057380ef9793e255af0af2a7c0f SHA-256: 40ce16bf252492743e8ea3a823ef84991e5dcf5ed276e8d8822b711ee76e1c7e
122 Risk Score

Malware Insights

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

This PDF document impersonates Microsoft and uses a fake CAPTCHA lure to trick users into clicking a malicious link. The embedded URL, https://netcdn.xyz/app/431946152/get-roblox-robux-free-game-hack, likely leads to a second-stage payload download or credential harvesting page. The document's content and heuristics strongly indicate a phishing or malware distribution attempt.

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.xyz/app/431946152/get-roblox-robux-free-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/get-roblox-robux-free-game-hack PDF link annotation
    • http://pietroubaldi.org.br/images/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-food_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_off00004fbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FBB 26444 bytes
SHA-256: dbd8e6467e351ea0eb229b89d8c01c3018265d8d69a247a225dbc9b8d2e84881
font_01_sfnt_off00008d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D77 18192 bytes
SHA-256: 907602cfc7341fc501dd3199c9640bb59b3f1be810cf9681d1f0358b1b1e552f

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