Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c827af8430644fe…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 01:13:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 98abcc6989b06bf7c28813864bdf811e SHA-1: 2b571461ba11b8415a1100983dd710a73bf0b6e0 SHA-256: 0c827af8430644fe821c92eca306162d2252110e50604fcd503a928f3674396c
82 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/claim-free-robux-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/roblox-how-to-be-copletely-white-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-cheats-for-phone-for-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-in-alternate-route_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-wings-codes-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-jailbreak-free-money-generator_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/flamethrower-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/script-hack-roblox-no-virus-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-cheat-to-the-end-of-any-roblox-obby_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/red-cropped-top-and-ripped-jeans-roblox-outfit-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3195 22076 bytes
SHA-256: 5627ea4ff36a0e088a700fede87be15649beb007681dd5bc64386996d4118a34
font_01_sfnt_off00006235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 19168 bytes
SHA-256: dfc8721fbf6b4988d00971a58b16fe325011594e1ee6efadf5a4fdcf2df05fca

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