Malicious PDF — malware analysis report

Static analysis result for SHA-256 2006d3c304456a20…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 16:44:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 767a528a676c11ecc16cd76a1c3eb2ba SHA-1: a9e00710090495058c774a1be2fe5b8190b2a379 SHA-256: 2006d3c304456a20dbf1ae6e617a4a2eb006c0842231fb72d8225bd3c999efbc
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/406889139/50-free-spins-coin-master-game-hack PDF link annotation
    • http://mklista.ru/images/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/roblox-pics_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/install-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://mklista.ru/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/robux-hacks-2021_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_off00004875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4875 26672 bytes
SHA-256: 4f0b4f60242156bb1ca45bdfd8e8d8b31a944ca59d4598e2a7e70b89a2a5b4d9
font_01_sfnt_off00008516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8516 18192 bytes
SHA-256: a4943b7840cd3959a8ceaa1ed690fa7e50048a9b71dafef76241fe8ac415bb35

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