Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78cb0a538295d03…

MALICIOUS

PDF

36.3 KB Created: 2021-06-27 16:35:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f29a566a66c7fa9e486d86e83d8d862d SHA-1: ad055bd87d22cba55740ce0d3fdd689e6a50b1fe SHA-256: a78cb0a538295d03515875c25cd2637635e41bd9849c3ed5f400663b8fe35825
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 ML classifier flagged it as malicious. The document body and heuristics indicate a lure for free game currency or hacks, directing users to a malicious URL. This suggests the PDF is designed to exploit users into visiting a site that likely hosts further malicious content or attempts to trick them into downloading malware.

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/free-roblox-game-card-codes-2021-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-wallpaper_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-website-that-works_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/ww-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hotels-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/long-pastel-hair-roblox-free-to-purchase_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.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/roblox-google-chrome-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-adder_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_off00003430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3430 22936 bytes
SHA-256: e0948e9dabdbdf88c6b48b85af50b670a2d68a26c02106fde0b07ec4083d1fc9
font_01_sfnt_off0000679c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 19484 bytes
SHA-256: 98b7162d1dea44dd0e9f83004cf5c2b4230efd1f530770fe98a90252352cc491

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