Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec18ecfbe95898f…

MALICIOUS

PDF

47.5 KB Created: 2021-05-15 09:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d66d50187765ea2130f14bf92ea5921a SHA-1: 9463f4941e717cc91274dae81db7637b3de8cd76 SHA-256: 3ec18ecfbe95898fe55c377a521dbc7560bbf27bc0fa3876c84ecf8bb94382e4
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 0.9013

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/406889139/daily-coin-master-free-spin-link-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-make-free-robux_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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 28516 bytes
SHA-256: 84ff085ea502c28033b101bfcf6c20b0c603499333a48d724c8c9f618181d299
font_01_sfnt_off00008b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4B 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off000096ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EC 18476 bytes
SHA-256: 0e8ff706f766ebeac8fd51df3b46864e48e50accc558ba14dc70aa8347bf43ac

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