Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3bb3b1d1bb6d31…

MALICIOUS

PDF

45.6 KB Created: 2021-06-07 18:23:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ccb3bd1af838a9acaa7ca501e2c2e07e SHA-1: cc3cb4d2c83376c557cbe441d90bf35a3edd473f SHA-256: 0c3bb3b1d1bb6d31477a5674edbdec83410f35463b95850e7227a8a4fdc68df6
82 Risk Score

Malware Insights

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

The PDF document impersonates Microsoft to lure users with a "free Roblox logo game hack" and contains a malicious link. The embedded URL `https://netcdn.tw/app/431946152/i-will-make-you-a-free-roblox-logo-game-hack` is highly suspicious and does not match the impersonated brand, indicating a likely credential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/i-will-make-you-a-free-roblox-logo-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/i-will-make-you-a-free-roblox-logo-game-hack PDF link annotation
    • http://sudamericarural.org/images/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/infinite-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/getrobux-info_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-hack-roblox-on-mobile_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_off0000515e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x515E 25640 bytes
SHA-256: 4b6f9358be9051de0031ba6d9ced494fc8a1d15fb61bf33222cf7ddc8fdbfad2
font_01_sfnt_off00008c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 19448 bytes
SHA-256: b5c0baa3c8828c3b12188a7d816d3dce3991694a14535dd454288db46827b371

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