Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac73ec94b49e023…

MALICIOUS

PDF

34.3 KB Created: 2021-06-20 03:41:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: efbb939ae5b7cc500672589bc9eb066a SHA-1: d3cb6534231d25b1488f209f1995c511e5c8d797 SHA-256: 4ac73ec94b49e0235e024b6cd66bface679da222144ddaf75c8f2a9fd8d3e564
90 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to external URLs that are designed to lure users into downloading potentially malicious files by promising game hacks or giveaways. The high ML score and specific heuristic firings indicate a malicious intent to redirect users to exploit or download further malware. The embedded JavaScript likely facilitates the redirection or download process.

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.co/app/431946152/roblox-giveaways-top-hack-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-comment-metre-un-script-cheat_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/getrobux-now_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-u-get-free-robux-2021_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/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robuxfree-con_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_off00002f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F38 22012 bytes
SHA-256: abc1a7e13cb0a6a4976c8fd559a45b479d272415dc065f6f637ff65ae1c48d7f
font_01_sfnt_off00005fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 19408 bytes
SHA-256: 30c69dcc083440e2c9640f9f3fc98544c22b74abfdcdcdfb2dc8202e4bb11563

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