Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8f1a8eb68d88eb…

MALICIOUS

PDF

34.6 KB Created: 2021-06-26 04:12:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fea1933a2ae51b06e3f9c71b475445bd SHA-1: d34c6ad92f87306f1153686bcc08c63f7b28d753 SHA-256: 8d8f1a8eb68d88eb6adcfbe2f66d2ce61700d10b59a056b8439434deb9e98492
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.co/app/431946152/step-3-enjoy-your-free-robux-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/roblox-jailbreak-hack-noclip-download_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-online-roblox-death-games_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hacking-peobel_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-coins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-on-in-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-not-downloads_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-fan-club_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
font_00_sfnt_off00002e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E29 22364 bytes
SHA-256: c23350f8d58dc6de27d4a9419b0866f11ef39fa08cd9b262e1324180eee8d6f1
font_01_sfnt_off00005ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 19700 bytes
SHA-256: de221d2b181bba017d44f4d388aa75332a329b6a086f6a282ac66d7c2c8f764a

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