Malicious PDF — malware analysis report

Static analysis result for SHA-256 6122e7609be0f322…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 20:35:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d168ed177e002d21d7705b0049613870 SHA-1: d6e8805cea60b956e423e275010c9db897f9d5dd SHA-256: 6122e7609be0f3223ef8e54c3f8cac5513853b68c3cbcfa54c0f2d158eed4e05
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links to external websites, many of which are related to obtaining free in-game currency or items for popular games like Robux and Minecraft. The primary URL, https://netcdn.tw/app/431946152/how-to-get-free-robux-lohith-gaming-game-hack, suggests a lure for free Robux. The heuristic PDF_SEO_LINK_FARM indicates a large number of such links, likely intended to drive traffic to potentially malicious or scam-related content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-lohith-gaming-game-hack PDF link annotation
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-hack-coin-master-android_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
font_00_sfnt_off0000516e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516E 25960 bytes
SHA-256: 276f820cfaa249479bab19616c1631b4e87bedfa5818e0efa669a76366169b85
font_01_sfnt_off00008b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 19344 bytes
SHA-256: c309217f3cf5f1d9db0625a377e518af730377a31060e44a412d713498ddbbd0

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