Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc9b2c5b43c266…

MALICIOUS

PDF

34.4 KB Created: 2021-06-22 05:08:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26bfab34577e28dc0fbd9f5d4ef8d352 SHA-1: 40d446d4e22adc93ccd6d31e354c1433ed957295 SHA-256: 28dc9b2c5b43c266391e8911d83f16cd26fba2a2388df002e1eb70eb0228e43c
150 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links designed to lure users into clicking on game hack generators and free currency sites. The primary goal appears to be directing users to potentially malicious websites, likely for credential harvesting or further malware delivery. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.co/app/431946152/hack-slash-roblox-id-game-hack PDF link annotation
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/get-free-robux-by-watching-videos_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/critical-strike-roblox-point-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/roblox-promo-codes-october-2021-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/free-coin-and-spin-link_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_off00003022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3022 22352 bytes
SHA-256: 25332eead07f048a6b368d6a4b4295d45e5bfffceacefa384ffbb804f7b9648b
font_01_sfnt_off00006190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6190 18996 bytes
SHA-256: acd1805954f736df431dd6b1bfda08c592e84b8def0df657aa19045ea78b8871

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