Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efcc9990a5796c0…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 14:55:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cbd5644115d1ee83f1d3b9e2685738f8 SHA-1: 3e1864b2df37871462c496a06688462f35367c61 SHA-256: 1efcc9990a5796c0f135bab3dedd6d8d075634ba7d337ef057c933da72344653
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, identified as a 'link farm' by heuristics. The primary lure is for game hacks and free currency, directing users to URLs such as 'https://netcdn.online/app/406889139/hack-coin-master-2021-game-hack'. The document body, though heavily obfuscated, contains similar references and metadata indicating it was generated by wkhtmltopdf. The presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/406889139/hack-coin-master-2021-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-items_GM479516143.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_004_off000052c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C0 30772 bytes
SHA-256: a0edc327321e6480ae747679a3cc4f14754c76c60ef3c4939b72dbeb13b46cbc
font_01_sfnt_off000091cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CF 18116 bytes
SHA-256: a3df71077179c7440b1e4836f0868e786a4fbdd8e53d65e7c5dca2578e10a822

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