Malicious PDF — malware analysis report

Static analysis result for SHA-256 821040ccf1ce70f4…

MALICIOUS

PDF

48.4 KB Created: 2021-05-14 18:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 54fab95f319a62938b6ee9f7156b70e2 SHA-1: 4cd2bec65f8d58ded0ff78abada01d97000a3fe1 SHA-256: 821040ccf1ce70f4ef6f9f18eec4ee0363705dfccda68f5db5ec97cc36c210e3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded URLs and a call-to-action phrase, impersonating a brand to lure users into clicking a link that leads to a 'free Robux generator'. The ML classifier flagged this PDF as malicious with high confidence. The presence of external URIs and brand impersonation for credential phishing suggests a malicious intent to trick users into downloading or interacting with further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/free-robux-generator-for-kids-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/free-robux-generator-for-kids-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-official-website_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-demon_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A81 29580 bytes
SHA-256: e7375c88e82f97c8cba0bae7a06cf8e6c82371cdfc3ceaefbf5139bad086b9c0
font_01_sfnt_off00008cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD6 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000997e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997E 18640 bytes
SHA-256: 699ebd5d78640cc812bbb586150daa4d415ceda65572c7c56e250d7f18cab54c

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