Malicious PDF — malware analysis report

Static analysis result for SHA-256 417f4c42ba1726cf…

MALICIOUS

PDF

37.3 KB Created: 2020-08-15 10:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f391a88fdf949018c340a07da7fb982 SHA-1: 7bef5b5dcc8500406a028e1414fab848918d5be3 SHA-256: 417f4c42ba1726cfcf069c7c3626ce06cbc2f52b9db5c0f1eaef124b9d087eb2
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing indicating it's a malicious redirector, linking to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the same malicious URL and references to design manuals, suggesting a lure. The numerous links to Shopify PDFs, while mostly benign, contribute to the link farm characteristic. No scripts were extracted from this sample.

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/wb?keyword=era%20design%20manual
    • http://files.aerocustoms.com/uploads/1/3/1/3/131383247/8ad2f3b610b.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zimupumunilojoduwa.pdf
    • https://cdn.shopify.com/s/files/1/0449/4671/8879/files/marketing_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/nudus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/ritanonosutifavetofategem.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3934/files/50440184241.pdf
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/bio_data_form_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/pdf_to_word_online_without_email.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/biological_psychological_and_social_factors_of_ptsd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/91804627166.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/cetonuria_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6589/files/learn_russian_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/change_computer_name_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/xezoseluli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a97.bin
cd0e02239db514ecf9262c1887663925e20369ad586f71e6d71e7838b0c33b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A97 4796 bytes
font_01_sfnt_off00005aae.bin
c33c0454c1d64ee0bbf90106efb5a9fea3119142f7a3ff2a5e61adbc1b5ebbb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAE 9340 bytes
font_02_sfnt_off00007a95.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A95 4324 bytes

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