Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ce939a3268e5a0…

MALICIOUS

PDF

37.7 KB Created: 2020-08-19 09:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81fd6a52166012bc41c9e2eebf287995 SHA-1: 340308e7afd5ef9cd96a2581063ade2473dfe6f0 SHA-256: f4ce939a3268e5a0815d0d6c108a31c5ab192f2fb88f31463c9d8534bf045ad5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded external links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. One of the URLs, 'https://ttraff.ru/pify?keyword=speak+now+karaoke+album', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to PDF files hosted on various domains, including Shopify. This suggests a campaign to drive traffic to potentially 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.ru/pify?keyword=speak+now+karaoke+album
    • http://files.maryjanemitchelldesigns.com/uploads/1/3/0/7/130776602/2121022.pdf
    • http://files.kalanimassage.com/uploads/1/3/0/8/130813054/9627874.pdf
    • http://zexalizi.machining-technology.com/uploads/1/3/1/0/131070356/fakurikatizeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/klrca_arbitration_rules_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/fitisidusone.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/lepexasisigana.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/jinukabemetajogutawanij.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/oops_interview_questions_and_answers_c_corner.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/birixagat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/gupegimoxasawowutaluxeguv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/mezajelixona.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/bronkopneumonia_anak_adalah.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_off0000481d.bin
9dfe86473e97fc0752cac1ead61b51ff0e590b641e84caa3add5b8d2ac255919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x481D 5188 bytes
font_01_sfnt_off000059ba.bin
198df3238c1299ebef17742bb71f28de2560e2aeb3cd56b1f2fa31c25917ec36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BA 15024 bytes

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