Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d83a8c6715335b…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 12:59:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 03d79dabefad8e3a272baa2c9adec4ab SHA-1: 1545ca0b9d6c331b648af341608f6173ee84a1ea SHA-256: 88d83a8c6715335b90289507e6e74387e83f82a08e12fe52b7d89fa2b67e7be0
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related content, suggesting a link farm or scam operation. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick users into interacting with the document, likely to download further malicious content or visit scam pages. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed for user interaction and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-user-cheat-buddy-roblox-game-hack
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-do-i-get-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/daily-coin-master-free-spins_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hacks-for-cards_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-minecraft-alts_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/rbx-free-roblox_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-gifts_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/pokemon-go-free-online_GM1094591345.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/mcpe-hacks_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/hack-coin-master-apk-mod_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-android-root_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-exploit-on-roblox-without-cheat-engine_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/spin-hack-for-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-for-kids_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-rtx-download-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ff.bin
2815dcf7759ecee5bc0392c58d774d933bf0ced0a92d274e889fc74b3a5d4e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FF 25416 bytes
font_01_sfnt_off00008f19.bin
8d03a8b06593df2b8797d4b31335d770dc8f3da16d0c9261c43a2db30f6b8557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F19 19128 bytes

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