Malicious PDF — malware analysis report

Static analysis result for SHA-256 86659eefaedb2365…

MALICIOUS

PDF

34.3 KB Created: 2021-06-30 05:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9de56f05d7baac12898e63604660e079 SHA-1: 4250606fd26713d3c54d0d2cd2cba01033bc9e99 SHA-256: 86659eefaedb23650eefa143e07e4d4e7b0e8159da409a513d704925067c144c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/mobi-hack-robux-hack-game-hack PDF link annotation
    • http://103.68.2.77/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdfPDF link annotation
    • http://103.68.2.77/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/why-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-codes-not-clickbait_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/roblox-exe-editor-cheat-engine_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/alone-in-roblox-free-money_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/how-to-get-unbanned-from-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/roblox-robux-maker-free_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/how-to-use-slayer-leecher-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-promocode-that-gives-you-750-000-robux_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-without-human-verification-ios_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-roblox-noclip-hacks_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_off00002dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD8 22864 bytes
SHA-256: f8a48f12302bc47e5553e5d011058f5741c37e5b62602e0eabdfc9db19c461d5
font_01_sfnt_off000060db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DB 19040 bytes
SHA-256: 3c36c856358d408fd38f86325ff6108c71e0676bbcde18eef03d10b301039c5a

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