Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9fa594a609d7d0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 07:59:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 449f378078a044a5368fbaccf8b1517d SHA-1: 6b910d3b8c23018bae5148c67648d43e92d3ff85 SHA-256: 6e9fa594a609d7d00740df508cabb32e73f3a2c0e409b34707f48985f06d1aab
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are structured as a link farm. The document body and extracted URLs suggest a lure for game-related cheats and codes, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.tw/app/431946152/free-roblox-codes-2021-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/best-roblox-hacks-gui_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/can-you-geet-banned-for-using-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/earn-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_off00002f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6D 22496 bytes
SHA-256: 3528196ef872656548c61130746ddb87445f62be78febe4920b9403b24ed05dc
font_01_sfnt_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 19228 bytes
SHA-256: ed0cdc110a2a956eeb6aac9ce416b1528a5bed00449fa61b89a4125e4ac6fa5f

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