Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bf50f5c18f805b…

MALICIOUS

PDF

47.2 KB Created: 2021-05-18 05:58:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 03a13f7e146c3e70c6b78c16648e4b16 SHA-1: 18226759771946b9eb316f40ef2cb4756292d91b SHA-256: 47bf50f5c18f805b9764b25f9f3c19be69985bdfb8628aee881ef0dcbe574b93
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 0.8948

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 https://netcdn.xyz/app/431946152/jailbreak-roblox-hack-game-hack PDF link annotation
    • https://yc-certify.com.tw/image/data/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/www-robux-redeem_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/cm-spins_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/instantrobux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/open-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B33 27916 bytes
SHA-256: 121e0c526ad6f9aa3d8af9dd1c69b5023ca94ba1b12e9e184f5f6e0979a85f46
font_01_sfnt_off00008abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABD 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9562 18468 bytes
SHA-256: 47180ef6fd58f08eabdcf8de8850cf434555edaa977bcc29afa6d0c928aef64e

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