Malicious PDF — malware analysis report

Static analysis result for SHA-256 1932c5c86eea318f…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 18:41:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c26d8a73dd7089f35daaa62109a57930 SHA-1: 9caf3e1192510fab7e4a69a295928f0a7e718a7d SHA-256: 1932c5c86eea318fadb4815f7f785a94f1ee9fd997f339b6d8ad80cc0378cb12
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites offering game hacks and free in-game currency, such as Coin Master and Robux. The primary link, https://netcdn.xyz/app/406889139/coin-master-hack-https-coinms-net-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt designed to drive traffic to potentially malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-https-coinms-net-game-hack In PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_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_off0000484d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x484D 25232 bytes
SHA-256: ae53d696671c24157467ee4be6dc8632072d55b1644ce7cd3b28e33df8bd1dbd
font_01_sfnt_off0000823a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 18152 bytes
SHA-256: 98ac4e66809d5f1f5b8246c3389f99af71150df64b93ee4f4ebb1a2fd2e53783

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