Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd205b1dead4ed6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 01:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d92d2fe1b93d38f59101ebd785726eba SHA-1: eed52a6ff4f6d809b982e1df53181b1f826a2a98 SHA-256: 2cd205b1dead4ed617836a122ccb181acf440cbf12112ed0269dea1b4ed3e8e2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or generators for in-game currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many SEO-optimized PDF links suggest a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the document's structure and embedded URLs indicate a phishing or malware distribution attempt.

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.tw/app/406889139/coin-master-hack-2021-game-hack PDF link annotation
    • http://niceviaapia.com.br/images/ckfinder/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/client-minecraft_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/bloxburg-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-hack-slx-roblox_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-your-hacked-account-back-roblox_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-hack-into-someones-roblox-account-2021-october_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-army-free-robux_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_off00003083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3083 22376 bytes
SHA-256: b3a8017e1cd6fcac4e04915db3072dd3e98764c9b8c736107642ba8a259d4d48
font_01_sfnt_off00006227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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