Malicious PDF — malware analysis report

Static analysis result for SHA-256 761b8a484dff2a20…

MALICIOUS

PDF

34.8 KB Created: 2021-06-23 07:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aece2f653b31adc161e4413a113225c2 SHA-1: 748699536ee3302b57275ba5cc25179ee08ac9a2 SHA-256: 761b8a484dff2a2038e33982009421e2b3f66471748ae5ee405536c63ff5e03f
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are related to game cheats and free in-game currency for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. The presence of a 'Download Button' heuristic further suggests a lure to download potentially harmful content.

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/roblox-cheat-for-brick-bronze-game-hack PDF link annotation
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-roblox-hacks-for-free_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-wls-3-hack_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-many-tiktok-free-folowers-make_GM835599320.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-how-to-get-free-robux-tips_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-play-roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-legally-get-free-spins-in-coin-master_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_off000030bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BF 22448 bytes
SHA-256: 3350bceefa233a88ba9e12f60e78fdeb74391c54369db6cd0d2b41a39cc082d1
font_01_sfnt_off00006292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 19292 bytes
SHA-256: 139606a3cfc3007b7ed15ab36d7a83543855401e55a3ecea6b8dde1ed8537860

Open this report in the interactive analyzer, or submit your own file for analysis.