Malicious PDF — malware analysis report

Static analysis result for SHA-256 074f41a23e99f385…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 06:07:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f8c1429b4a1468848e312385bf4c7fe4 SHA-1: 7490934687f9f18a8561b5acfe3a90c44b36e03d SHA-256: 074f41a23e99f385df9082662823905aee67e170c117a226ffd2a6dce1034abe
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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/coin-master-fan-club-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/speed-hack-download-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-speed-race-hack_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-to-have-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-hacks-for-good_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/113-hacked-client_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-stuff-on-roblox-games_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hacker-roblox-t-shirts_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-robux-no-human-verification_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_off0000375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x375B 22664 bytes
SHA-256: f31fb504712e58e094c9c893f12b0a6b1870b2717380692bba4a355775fc2ce8
font_01_sfnt_off00006a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A05 18372 bytes
SHA-256: 22074970575eadcad87cb52a622e0a0fed1ce08607426e4f3de5779985964155

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