Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c0dae62df4f867…

MALICIOUS

PDF

41.6 KB Created: 2021-05-19 16:34:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d66a9eed7c623d8cecea49f5dff099aa SHA-1: 1106aa83bde8f22ee2dfec7fde2ffaef8e47e0ad SHA-256: 18c0dae62df4f8670c79312e381b0d44c07c291a4b025d586eb20c5fa3616780
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-gold-cards-free-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/robux-games_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_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
stream_003_off000048e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E0 24864 bytes
SHA-256: 10882c084ebea262c801151af3ab234f3975f6b33444ba8be4fb922d01fe8dc1
font_01_sfnt_off00008151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8151 17960 bytes
SHA-256: 5f0d383e38c54a4b706fba9e56337a6488be6196f7a5d6bfa1241f48271576e4

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