Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce5f30c5698baf1…

MALICIOUS

PDF

45.2 KB Created: 2021-06-02 09:22:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 11971e8e321d80e07c08605cdb39c609 SHA-1: 6d2cd71f32117c4684dba93dc30ee79f8d3e9282 SHA-256: dce5f30c5698baf158113cdb211ddcaf96a9cd7ba295a2d227cb4217989886d5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as game-related resources like 'free robux' or 'coin master spins'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure itself contains URI actions that lead to these potentially malicious URLs.

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.xyz/app/431946152/roblox-free-shirts-id-game-hack PDF link annotation
    • http://montchanintt.fr/images/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://montchanintt.fr/images/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-generator-no-verification-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_off00004e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E56 28764 bytes
SHA-256: bb1c624dd649aeaa60e6796800cbf8464c80c93c7d68e82791825e6076173143
font_01_sfnt_off00008dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAD 18512 bytes
SHA-256: 0fc58c91d4b2920ebe53160a14af275036d39e5abc8d0e9c1fc05599c3b977bd

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