Malicious PDF — malware analysis report

Static analysis result for SHA-256 889789e7c8c4a724…

MALICIOUS

PDF

35.4 KB Created: 2021-07-01 17:51:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 838b2cc70d10d0d353b6fadaa2d7c5d4 SHA-1: a9b37f6cf75d29bd7d705d1fa3748fe90bef794d SHA-256: 889789e7c8c4a7243e13bed57acdcd9333e2e3e8f1b02750bb61ccc0f45e534a
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as PDF files promising game hacks and currency. This indicates a lure to download potentially malicious content or visit phishing sites. The heuristic firings strongly suggest this PDF is part of a link farm designed to redirect users to these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/robux-hack-tool-online-game-hack PDF link annotation
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-free-robux-hack-code_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/hacker-scp-roblox_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/cheat-menu-roblox_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/giving-people-free-robux-live-stream_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/free-robux-hack-legit-working_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-hack-roblox-models_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-highschool-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/jailbreak-roblox-cheats-cage_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/test-your-own-roblox-shirt-for-free_GM431946152.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_off00003337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3337 22612 bytes
SHA-256: e9d495dfc5abed52f22aa5197487c5f3af1e48df1613b4931b0f08c7ebe88b9b
font_01_sfnt_off000065ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 18916 bytes
SHA-256: 8b8d215099f36954f59dfb0bcbe58f08c82f44d3d48b8470ece8eba753e8ed19

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