Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2be99c2131f338…

MALICIOUS

PDF

35.5 KB Created: 2021-07-01 18:02:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f0eff0a41a319b255b99d4ea0dfbe1c1 SHA-1: 49748c4a8581fde32b98b6493e10891c5ad2ce24 SHA-256: 8f2be99c2131f338bb2b208d51a332f999abb95edf7d85c6e0bcc170c9e91bae
228 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple links designed to lure users into clicking on what appear to be game hacks or free currency generators. These links redirect to malicious infrastructure, indicating an attempt to exploit user interest in popular games for malicious purposes. The presence of embedded JavaScript suggests the potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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
  • 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/robux-free-robux-no-human-verification-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/dragon-ball-galaxy-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-pins-for-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-i-earn-robux-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-hack-trigon_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-catalog-items-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-spins-app_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_off00003196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3196 22924 bytes
SHA-256: 32f5a329c9d72c2da2f2890622dcd02bf6bbcd67c1e0c973c4c5f62a247a0c44
font_01_sfnt_off0000650b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 19336 bytes
SHA-256: 9b6dfddc29abad12f940b5e5276664d8362a615c75a511d7c794304ab6e182b3

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