Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa73a0f32aa09c02…

MALICIOUS

PDF

39.1 KB Created: 2020-09-07 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6251895c4d049fd2925bebb59de46e15 SHA-1: 4e977ecd89c00f315a8a4e8517f8c754ffed42e2 SHA-256: aa73a0f32aa09c02ec864e9fec4107867efd740951fd68e2ddc2d7031103afdf
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=bkav+pro+full'. This URL is likely used to deliver a malicious payload or conduct phishing. The document also contains a large number of embedded links, many of which point to 'static.usrfiles.com', suggesting a link farm or redirection strategy. The document body itself is heavily obfuscated and contains the malicious URL.

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.club/wix?keyword=bkav+pro+full
    • https://static.usrfiles.com/ugd/6fd45c_5d7fa354822b4944805ca9c609d45711.pdf
    • https://static.usrfiles.com/ugd/23e9be_a37b1187b1f1444baafcf46faf6fef30.pdf
    • https://static.usrfiles.com/ugd/d51d36_579bc17c91ba4532979fe9cc2fc6f9f6.pdf
    • https://static.usrfiles.com/ugd/bae363_db287141faac406ebc69561a7a178f4d.pdf
    • https://static.usrfiles.com/ugd/895bef_5929a8d0b8154583a16e4cf5fbce7e55.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b3ea172b5c2452ca0f08364a1105733.pdf
    • https://static.usrfiles.com/ugd/804ff6_1e870980f0c44c7b905e1ca8f768a39b.pdf
    • https://static.usrfiles.com/ugd/d1d005_7eaa0c45e6ac4c79879ed942bcea6bf5.pdf
    • https://static.usrfiles.com/ugd/cc14e4_5d9f89ef03d74f3b8a91b9b7c0d316fd.pdf
    • https://cdn.shopify.com/s/files/1/0448/9166/8647/files/nutuvotatokitokesuvavebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/articles_worksheet_for_first_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/43356501078.pdf
    • https://cdn.shopify.com/s/files/1/0467/5813/3923/files/34012348756.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/aisc_steel_construction_manual.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_off00005d10.bin
8d7273e5c1955b235ca0d927167bd29ebd8b35ed3dd11aa33727c4ea3f97db3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D10 4888 bytes
font_01_sfnt_off00006dd3.bin
cdf7d8f55d0c418154a42c03d848ff733a616f2c2ee476b159e5cd30860e7bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD3 10108 bytes

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