Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6924f050a3a160…

MALICIOUS

PDF

44.4 KB Created: 2020-09-06 18:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7353ada5bfd4c3e06fe7e9d114a7088e SHA-1: 308369033068199d850d86e488dd7b9b1544dcbc SHA-256: bc6924f050a3a1604205c02e221e161090749e687b0e38599daf4131b1bd0f72
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as IELTS exam materials, designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.link/wix?keyword=ielts+plus+3+reading+test+6+answers. The document body is heavily obfuscated but contains references to the lure and the malicious URL. The heuristic firings confirm the presence of a malicious redirector and a link farm.

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.link/wix?keyword=ielts+plus+3+reading+test+6+answers
    • https://static.usrfiles.com/ugd/1813b3_162053a5eee947d8b7a5b4264535a45e.pdf
    • https://static.usrfiles.com/ugd/760101_298fe3b03a4144d1bbcf73e5c6ae218e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba35f68e64be4f1b87465592e5808535.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/vodasezikufanuvewizuweraw.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/25481124676.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/nipizolujevako.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/bhopal_disaster_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/61326033274.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6243/files/dafazof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/44331541166.pdf
    • https://static.usrfiles.com/ugd/07625c_60fb997b2adf4fb6bc7940cb8a279749.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d2526c93cb496e9193eaea4a828be4.pdf
    • https://static.usrfiles.com/ugd/b98abb_d79e242c3f5a4db4a2d01d203a970ed8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000705a.bin
56195ff875004e8537623745297bd8da3560f7a1a3eee2e2ea765f84a6672bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705A 5476 bytes
font_01_sfnt_off0000830f.bin
a539d1f2a03b856a9fb2de12e0a6f0574bf3de4088df93700e12a7791f77d3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830F 9840 bytes

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