Malicious PDF — malware analysis report

Static analysis result for SHA-256 6250f99542e5e8c4…

MALICIOUS

PDF

39.7 KB Created: 2021-04-27 05:27:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b84ed6bacfeadc39c95e1605a41e6da8 SHA-1: 717a44e6f71cb9d8b32c5269af2dde3c4b7e3e5e SHA-256: 6250f99542e5e8c430318910060808c1102e6454c7fca812866ef443e6d74fd2
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to Roblox hacks and impersonates Facebook to encourage users to click on a malicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of brand impersonation and a call-to-action button further supports a phishing or malware delivery attempt. The embedded URLs likely lead to further stages of the attack.

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-what-is-e-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/roblox-what-is-e-free-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/roblox-snowman-package-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/create-own-free-skin-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-in-roblox-iphone.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-free-modles.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/what-does-ce-stand-for-the-hack-for-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-a-lot-of-robux-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-dance-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-really-easy.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-hats-on-roblox-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-redeem-toy-codes-free.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_off0000414e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x414E 24100 bytes
SHA-256: c3a0133d999b258644f9d26f7cab9c2733c6565aef5b84020327ca876b3bbf7e
font_01_sfnt_off00007826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7826 18644 bytes
SHA-256: 37b7b9fa83afdb4e7a23b288de1625c20d21ba33584c9126b58ee82be310ebb2

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