Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51890c90170d2fe…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f2006763d4a2f26b2c782b11495d9ca SHA-1: 60bc9a5d1845e606bd5ff45cb488f949df6f3f5f SHA-256: b51890c90170d2fe123e6d4649122f37f9e9c86b7a638ca72e5536e2c17e9a75
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.cc/pify?keyword=include+css+stylesheet, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to CSS stylesheets and also repeats the malicious URL, suggesting a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=include+css+stylesheet
    • https://static.usrfiles.com/ugd/c12414_8e66c7c7d1ba417f819f1364523df403.pdf
    • https://static.usrfiles.com/ugd/b8c837_82286ee8293442c8a336b04116693c48.pdf
    • https://static.usrfiles.com/ugd/b8c837_25be870bcae54319834838de3ad27dae.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3864/files/common_functional_groups.pdf
    • https://cdn.shopify.com/s/files/1/0439/6669/3534/files/p90x3_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/ankylosing_spondylitis_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/19342304177.pdf
    • https://static.usrfiles.com/ugd/b8c837_cade67cea84a41fc9e88258cc3f9f00a.pdf
    • https://static.usrfiles.com/ugd/f967ac_b0d2375c18d44e7b9864e2bc8c6f5dc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0893b9117fc24951aa6f7b0ce4139260.pdf
    • https://static.usrfiles.com/ugd/b8c837_245ffa7f2bc344569f12a01034556000.pdf
    • https://static.usrfiles.com/ugd/122077_e6993e3d8fef4f3596cd81847428b558.pdf
    • https://static.usrfiles.com/ugd/b8c837_7259aaa7c7974f3795a3929b44164ed5.pdf
    • https://static.usrfiles.com/ugd/eda9ba_bab8c6e2f2f74adba4971b59ae954248.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_off0000702f.bin
8ec3b9b1fb10100e750f1ff84f7f949c58a542e8d0b0b51840eaecc0451ee1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702F 4760 bytes
font_01_sfnt_off00008068.bin
f08467345b8c5ed6d4442257d22deed1f04578737bb3adcdbf2942f396a8b854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 15180 bytes

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