Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1a755d76341999…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 22:17:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 32e194746b8fec36df948273e6884f83 SHA-1: 7a34ca8dae02b182738d7b3275e901cf528eba2a SHA-256: 4c1a755d763419992d717be987b5ef233eb6cadf0173f78df81e90c082e0979e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, primarily pointing to game hack generators and free in-game currency lures. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' indicates a direct link to a 'coin-master-free-spins-only-game-hack' URL. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests the PDF is part of a larger network of SEO-optimized PDFs hosted on 'zustsearch.com', likely designed to drive traffic or distribute further malicious content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or redirection attack.

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-free-spins-only-game-hack PDF link annotation
    • https://zustsearch.com/uploaded_files/userfiles/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/unlimited-robux-hack-for-computer_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/oprewards-hack-roblox_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-new-monstersimulator-hack-script_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/just-go-to-mobihack-robloxhack_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/games-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-free-robux-codes-without-bc_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-promo-codes-2021-december-free-robux_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-1-million-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-free-skins-in-minecraft_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
font_00_sfnt_off000032a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A2 22744 bytes
SHA-256: 6d14592ebf36be2b4c77c9eb24a052a2e13c946d259b6a0b35d5e68771725604
font_01_sfnt_off00006538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 18428 bytes
SHA-256: f57f8b21c02b66169ef231feeb17cfb16603379852549c8906bae8109884bca6

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