Malicious PDF — malware analysis report

Static analysis result for SHA-256 574ff323e84ee889…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 05:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f891a6845100b6c4bbe531121cb1daf SHA-1: 4dd395b4763860e8070dbcb3202abc74d002c731 SHA-256: 574ff323e84ee889f0ec07c60348c9b25b356d7036b86f7a621c58e33aa39025
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link, 'https://ttraff.ru/wb?keyword=barron's%20gre%20math%20workbook%202nd%20edition%20pdf%20free%20download', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing a free study guide.

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=barron
    • http://files.pennycollector.com/uploads/1/3/1/4/131453682/jepikorilif.pdf
    • http://nasenini.fireflyfamilydaycare.com/uploads/1/3/2/8/132814930/vakado.pdf
    • http://files.chrisratliff.com/uploads/1/3/2/7/132712096/1125e6f8b0f4c.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/tuzajatisifuloresadipijix.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/raspberry_pi_user_guide_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/7527/0811/files/sutafirakon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/67197764458.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/kogafakiwam.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/71430991321.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/deductive_and_inductive_learning.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/53310295950.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/solidworks_2d_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/maxavakiloxosibobedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/5698965334.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_off000060b4.bin
48ac7a7f607a960bbc9720127f41e6a4a52a2c4a5bad438c930fbc761579d1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 5964 bytes
font_01_sfnt_off000074f0.bin
1c41725ca2af70ee17b3650cf3cb79916e2a1eb5a96f2f547773e0f6f2583903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 10740 bytes

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