Malicious PDF — malware analysis report

Static analysis result for SHA-256 470f3dec0aee3823…

MALICIOUS

PDF

44.6 KB Created: 2021-06-11 07:05:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b253ffa9f7c523a79a8006090e5f1a2 SHA-1: ed7be616ae4122287760d6fb882c5199709b6b89 SHA-256: 470f3dec0aee3823bdc44d8b0f4a2e6ff1179be3dbc09aaf73a7175a68e34e36
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains embedded URLs and a call-to-action lure, impersonating Microsoft to trick users into clicking a link for 'free Robux'. The primary malicious URL, https://netcdn.tw/app/431946152/robux-800-free-game-hack, is suspicious and likely leads to credential harvesting or a further malware download. No scripts were extracted, but the presence of embedded URLs and the brand impersonation strongly indicate a phishing or social engineering attack.

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-800-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.tw/app/431946152/robux-800-free-game-hack PDF link annotation
    • http://library.ft.upnvj.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/kuso-icu-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-spin-link-for-coin-master-haktuts_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_off000051a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A7 24928 bytes
SHA-256: 7b195ca7b8d30a71c0244360a8038d72b236810d7f8391bb8a8408eeebd5c71e
font_01_sfnt_off00008b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B61 18396 bytes
SHA-256: 37047f47249cb07df4ef9153038710181cef6d5d904632e620690ac1d8cbba84

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