Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd011c88ba7dca…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 13:41:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ccd33f677733ec59525c521cd61a1a2 SHA-1: 03a5be1b50f4cb6178807e12be3c53c6550aeb20 SHA-256: 0cfd011c88ba7dca928419e35035b97aadc741471f35271920d8dd3bf1a956ed
90 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high-confidence heuristic firing for a game hack redirect lure. The document body and extracted URLs indicate a social engineering attempt to trick users into visiting a malicious website, likely to download further malware or engage in credential harvesting. The embedded JavaScript is likely responsible for executing the redirection or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.tw/app/406889139/blogger-coin-master-free-spins-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/follow-bot-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-video-cracked_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-more-robux-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-bloxburg-on-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-100-bonus_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pokemon-go-free-km_GM1094591345.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-and-coins-hack_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/roblox-booga-booga-cheat-duplicate-items_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-spins-on-coin-master-ios_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
stream_002_off000032d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D9 23296 bytes
SHA-256: cd43339ab9e6ace23a6d28fdd4ce0959bcba026e9af9e88d222788a0e966d3b6
font_01_sfnt_off00006714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6714 18464 bytes
SHA-256: f296297f24d16be59dfb68755b8dea07f16f55f25f89e3d3dbe8c2451ee9dbcd

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