Malicious PDF — malware analysis report

Static analysis result for SHA-256 1601d32e8cc18813…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 03:20:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 184292fdf7562769bf7a52a8aed8b3bc SHA-1: 551429a534fdde6a50fb970c664be7a3049315fc SHA-256: 1601d32e8cc18813101d274d21f3cec77093bb09e0a95331d9ec387f92cf2873
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are related to game hacks and free in-game currency, suggesting a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized PDF links further supports a malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hacks-counter-blox-roblox-offensive-2021-game-hack PDF link annotation
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-mad-city-cheat-download_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-hack-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-free-candy-van-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-dont-sign-up-for-free_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-roblox-muscles-t-shirt_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-be-an-admin-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-bedrock-minecraft_GM479516143.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_off00002f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F31 22428 bytes
SHA-256: 832d06bbde79bf32a0b219b7dd520e97906b676574d8e9adb82acfe8577c8145
font_01_sfnt_off00006111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 19536 bytes
SHA-256: c365c94441475b70a01b713d80b753d789bf5152a3fa5db2ba0025b3f4cc9618

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