Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8513f14ef2f50a3…

MALICIOUS

PDF

52.3 KB Created: 2021-06-09 10:38:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 975142bf18b5b2937d4c817d763e0ffe SHA-1: caa4110587967601d84ef5ab8ec43dadd66960b9 SHA-256: d8513f14ef2f50a3501330f9ead5aeb6cfa32a85e7cabeb39aaf5d9fddbed27f
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, attempting to trick the user into clicking a link to obtain free Robux. The embedded URL and numerous other URLs point to domains associated with scams or potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-robux-on-the-payment-section-game-hack PDF link annotation
    • http://brinicombe.co.uk/images/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/i-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-games-free-roblox-games_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-a_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E5 24716 bytes
SHA-256: e636a55511cd02e50a6ee22c45f15fdbf4adc5e70a374d84f1570aece639bd6f
font_01_sfnt_off00008ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB0 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off0000a71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA71B 19388 bytes
SHA-256: e5cb8630f1edef5bb7d6b1771f68c84deafbdbcd21123e9682e562cff219a51f

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