Malicious PDF — malware analysis report

Static analysis result for SHA-256 9819cf34825d7102…

MALICIOUS

PDF

34.7 KB Created: 2021-06-18 17:06:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c1f01709b331c3deb4ee5d80955da49 SHA-1: d3fa64874ce6f1ddd8df046b2f2c7ec45899ed21 SHA-256: 9819cf34825d7102784e5f5f7f633a85b013fcae563b20d32ffdc7241c77544a
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 0.9980

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 http://netcdn.co/app/431946152/how-to-get-100-robux-fast-and-free-game-hack PDF link annotation
    • http://www.siahotel.com/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-watch-any-movie-for-free-tiktok-hack_GM835599320.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/prison-life-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.siahotel.com/userfiles/files/roblox-robux-hack-android-apk_GM431946152.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
font_00_sfnt_off000030a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 21968 bytes
SHA-256: 980be15af619bf689ab0ab0547a9b7e2801087f17ddc2ac72fe2d634a623d35b
font_01_sfnt_off00006128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 19436 bytes
SHA-256: b4ab9094e95e3a793712ed4d16ef3d57ffc3e6ed7ea2d0ffe28c5989d159151a

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