Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5103d13185af395…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 09:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fdacf6ec04131c3a647f7b9102a37dc SHA-1: b3ad22746ec536e61648ff3b61e2e6093d58801c SHA-256: c5103d13185af3956e5d6ad860bf8679c5a0ba0063fbe9925bed3e7a61ab33ad
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 a reference guide, with the primary link redirecting to known malicious infrastructure. The document body is heavily obfuscated and contains the malicious redirector URL. The heuristic firings indicate the PDF is a link farm designed to lead users to harmful sites.

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=quickstudy+laminated+reference+guide
    • https://static.usrfiles.com/ugd/b8c837_a6ddb78312ce49768f5daf9ceeee655e.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_aa9f334e100e4654a13fa43d3cc60255.pdf
    • https://static.usrfiles.com/ugd/b8c837_29ffe30b108647d0a3a8c20d0ba16e14.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_04f4ed44df9a469e83e654b6162b40b5.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/27769147318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/adventure_time_season_11_comic.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/sataj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/lometurad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://static.usrfiles.com/ugd/f55bec_8777ad824c474968b3214f4c9b90dcf7.pdf
    • https://static.usrfiles.com/ugd/29c71c_1aae4a0879b948ce9f32908f4cbe14f4.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_off0000559f.bin
81022583ff1ef48acb1224868c2d4ab786a9ad2fb5ee59ef29df09969132eea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5568 bytes
font_01_sfnt_off00006886.bin
1e63f6a46846acbcdc5925e18558284e2287672872b9e2ea7a2ee124799504b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6886 10872 bytes

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