Malicious PDF — malware analysis report

Static analysis result for SHA-256 035875fea17cae73…

MALICIOUS

PDF

35.8 KB Created: 2021-07-01 13:34:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f97c5372336269f499f754ccd745196 SHA-1: 2451ad0f689e29af701ac53f1c5c0b87b12378af SHA-256: 035875fea17cae73d07f8d31e0e1f7eb48d04d50ae99c7f718c78ca0adcde37b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a document body that explicitly advertises 'free Robux' and 'game hacks', aiming to trick users into downloading a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the downloaded content may be an encrypted archive, further indicating a malicious intent to bypass security controls. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/how-to-get-free-robux-2021-to-keep-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-hack-on-roblox-no-email-or-no-password_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spin-hack-flight-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-game-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hacker-simulator-roblox-code_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/dev-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-people-and-get-there-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-a-roblox-account-using-cookies_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-for-no-cost_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/como-hackear-un-juego-de-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/cheat-engine-67-roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/rocash-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/microsoft-bing-free-robux_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_off000033ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EC 22192 bytes
SHA-256: 8b7ac6ae40eb92ea3d153cb2ff1e7e45e255651db85d46f27f5eb66904ea3c0f
font_01_sfnt_off0000650b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 19564 bytes
SHA-256: de1e064f72189dae3160fad9e7ecb18685e433199d0777d243e6576edcba6922

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