Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9acf2d13fb080c9…

MALICIOUS

PDF

33.5 KB Created: 2021-06-29 02:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 539604c331dc405f6f74df2ff74a09aa SHA-1: 440c4fa08e96552241c0c9da0568248bcc248ce6 SHA-256: b9acf2d13fb080c91e7803f4549a449c67833ddf009e61ef38c74899c7fcc518
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including a primary redirector disguised as a game hack. The document body and heuristics indicate a lure for game-related cheats, likely to drive traffic to a link farm or SEO manipulation site. The embedded JavaScript and extensive link farm suggest an attempt to lead users to potentially malicious or unwanted content.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/free-overseer-roblox-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-trur-false_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/best-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-in-roblox-generator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/impact-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spam-text-for-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-tool-no-survey_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_off00002e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7D 21812 bytes
SHA-256: 4af4bc10539da8759bcf482f4fdd92b04a7b1c0d53293e0bb707ea51c81d4c28
font_01_sfnt_off00005eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 18764 bytes
SHA-256: c9fa23ea70dc86caf75f9e3c633c7dc822757e1e725966c91c6aedcc92918430

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