Malicious PDF — malware analysis report

Static analysis result for SHA-256 d762f4eab2c67d76…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 08:12:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 009770e06acb402d0ac4bc209b5b8ef9 SHA-1: 533b7f87be1f825f321c37872c47ad0d49460cb4 SHA-256: d762f4eab2c67d76201f0553b65d867d89db1a938523c334e0b2a16937eb44a4
82 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'Robux Generator' and impersonates Microsoft, directing users to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of an external URI points to a potential download or phishing attempt. No scripts were extracted, but the document structure and embedded URI suggest it's designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/robux-generator-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.tw/app/431946152/robux-generator-free-robux-game-hack PDF link annotation
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/roblox-hack-deutsch-pc-weg-machen_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/get-robux-free-hack_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/tiktok-free-like_GM835599320.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-play-piano-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/roblox-jump-hack-check-cashed_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/cool-roblox-outfits-for-free_GM431946152.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
font_00_sfnt_off0000506f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506F 24452 bytes
SHA-256: 32f3ea0bc234699935b42abd4c009f3840f3c2cd5048eab1328d666161507f20
font_01_sfnt_off00008875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8875 18344 bytes
SHA-256: b95a12da119061680783165ebb2e6d7fcd8721f4f5b031393c447611c2dcd484

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