Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6d544bee4166b4…

MALICIOUS

PDF

28.4 KB Created: 2021-05-10 19:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d17ef1967c4460803036af6c79991d82 SHA-1: 82447e43cda8ca1f4cca1e32b6bb271f05738c69 SHA-256: 6b6d544bee4166b44901dcae1f4641f6856d2e562ef2dbd856dd98d316a72ac3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs disguised as links to free game currency and hacks for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document body and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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.xyz/app/431946152/rblx-gg-free-robux-game-hack PDF link annotation
    • https://mountainholidaytreks.com/userfiles/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/games-like-minecraft-but-free_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_off0000222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222E 19800 bytes
SHA-256: 1b0ad9a691fc9eae3dd768509202c83407f17e550dfcb70baa154adf786be2b3
font_01_sfnt_off00004bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFC 18376 bytes
SHA-256: 79d8ff6bb54f2bd25fce5899da6b269aa8d0d1da5a030d2c5dfc49c812010b5b

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