Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cff07159ed780b…

MALICIOUS

PDF

44.6 KB Created: 2021-06-07 19:20:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b801fb8cdf6376f64376d78efc6b398 SHA-1: c83665fa4120e075d7c3788147b9f9949c2a92cb SHA-256: 07cff07159ed780b3770c3316a87b7bc0ac7d56f13f707cd34dfacb244ecd8dc
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 visual call-to-action, masquerading as a lure for 'Free Robux' and impersonating eBay. The primary malicious URL, https://netcdn.tw/app/431946152/free-robux-message-game-hack, is designed to likely download a second-stage payload or redirect the user to a credential harvesting page. The ML classifier strongly supports the malicious verdict.

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/free-robux-message-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/free-robux-message-game-hack PDF link annotation
    • http://linens.kiev.ua/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-gray-pants-roblox_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-hacks-with-windows-8_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-1021_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_off00004ea5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA5 25500 bytes
SHA-256: ac44b8d93613c4a09566b59e73c423d953a7f02e24b727290876830765e4daa0
font_01_sfnt_off00008a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A82 18728 bytes
SHA-256: 739102952507e07f87a7acd6a54a9ca2052ab77410f21c7116c8adec73f927ef

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