Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9983fb65923984b…

MALICIOUS

PDF

44.0 KB Created: 2021-05-15 04:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 98cf1b6a9ebbd884db452baceb93ce1f SHA-1: 4ecc956efd18ee6153b451ff73b638df5bc2d1eb SHA-256: c9983fb65923984b5ab64c013feb7a86d84a66568a64632dfc2c117aec31f925
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9648

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coin-master-website-game-hack PDF link annotation
    • https://iear.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://iear.com.tw/image/data/files/free-robux-no-survey_GM431946152.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_off000048b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B1 24336 bytes
SHA-256: e7cfece89b0b6ff39e8f03e5b13a8744c1efc50bc2ece4b6859f1c05c48f49f3
font_01_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A56 17900 bytes
SHA-256: decb0c413fa85b8530be01f527249ec626c34e53c28067a93855c78243a97237

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