Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6b0fcb2c96e35b…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 14:03:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c2618f1a6f6ca2ce6f5d315eb11d2bf8 SHA-1: ab7602bbf18c3af2ae7e707a27440cc857f41acc SHA-256: ff6b0fcb2c96e35be9b47f975b8baeba857bf75b894114b3e9b403b30e890ac7
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are SEO-optimized for game hacks and free currency. The presence of a fake CAPTCHA lure suggests an attempt to trick the user into interacting with these links, likely leading to a malicious download or scam. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.xyz/app/406889139/coin-master-hack-apk-latest-version-2021-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/wurst-hacks_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
stream_003_off00004b8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8F 24352 bytes
SHA-256: c18ab543fcfe50acad839ee08735bfe62e4d2583a4561bb0669cba56a3153f42
font_01_sfnt_off00008372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8372 18428 bytes
SHA-256: 3ea7a61419cbe52eb029f29c9b150dae48cf78ebe9ef7deec7bc9e8a272032f3

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