Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31c12a18e704367…

MALICIOUS

PDF

37.3 KB Created: 2020-08-30 02:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e730b39188825e8f31ff6a4cc6383bd SHA-1: b00a92bdf40cb7019f93f6439d35204e5597dda4 SHA-256: f31c12a18e704367c7cafdbce2ba5b281307fda2d557b1d5a2c03807e1e1a134
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to ttraff.ru. The document body, though heavily obfuscated, contains text related to algebraic equations, likely serving as a lure. The file also exhibits characteristics of a link farm, embedding numerous external PDF links, with the primary malicious link directing to a known malicious domain.

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.ru/wix?keyword=forming+and+solving+algebraic+equations+worksheet
    • https://static.usrfiles.com/ugd/b8c837_302454ce0cdf42f5b196069a7f5d608f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4804ca04b30c4059b20f13b35074033c.pdf
    • https://static.usrfiles.com/ugd/eb4c03_9ca1f5ae2734499fabac37e86f4e6b3e.pdf
    • https://static.usrfiles.com/ugd/857e61_ae5183928dcf47c7ac87f00cc54b51d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f05633342643548e1a060c9763ae51.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1448/files/composicion_amalgama_dental.pdf
    • https://static.usrfiles.com/ugd/ab0441_69782c66fe9942f2b21244a1915ffaf3.pdf
    • https://static.usrfiles.com/ugd/c1de29_22ceccecf5134fa39d5d28e3060d7950.pdf
    • https://static.usrfiles.com/ugd/b8c837_74beb7bea6ba4e3fb1485657d6d6f66d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://static.usrfiles.com/ugd/05900a_bf48a0a685654a57977ae82fa1b25166.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_df934dcb00f94ccf9c35c96653e8c771.pdf
    • https://static.usrfiles.com/ugd/1e32c2_8243fca7d83d4358bebdfe9a1af87e83.pdf
    • https://static.usrfiles.com/ugd/b8c837_9409e76bcbbd491ca9a1a541b54bb787.pdf
    • https://static.usrfiles.com/ugd/b8c837_6318aef9c09f4bc9a2495f8a4d4f9321.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_off000050ad.bin
e69e9e0027d436089e19b1638a91820020e0c91f907febc82906852b62ceb8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50AD 5792 bytes
font_01_sfnt_off0000643f.bin
ee67ae46b91d489e0b7807a528ad7ceb1f0863db3b5c1b01dcd4cbbafa1173bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 9992 bytes

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