Malicious PDF — malware analysis report

Static analysis result for SHA-256 365fb379f9c733c6…

MALICIOUS

PDF

41.1 KB Created: 2020-09-05 04:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5747c66da6717b6ea03f8ec146a17842 SHA-1: 94d1a433002e1669f47cb2312c10e307198a839c SHA-256: 365fb379f9c733c62a87f4e70c011174d4f4f2aa03cc95aefcd225c72015f59f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, https://ttraff.link/wix?keyword=characteristics+of+a+good+computer+lab+pdf, is flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic as pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same URL and other Shopify links, suggesting a coordinated effort to distribute malicious content.

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.link/wix?keyword=characteristics+of+a+good+computer+lab+pdf
    • https://cdn.shopify.com/s/files/1/0439/1380/5992/files/bejixopenigatilexezobe.pdf
    • https://cdn.shopify.com/s/files/1/0461/8380/9187/files/imminent_eclampsia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/sisakijalabedobalox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/blizzard_going_slow.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/38996479706.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/8630063620.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/25850944765.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/zapomivupizemasojul.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/modern_resume_template_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6403/files/psychology_books_in_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/laws_by_plato.pdf
    • https://cdn.shopify.com/s/files/1/0432/6912/8354/files/davids_bridal_shoe_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7509/2132/files/sipolituxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/76195495440.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_off00006336.bin
70fbbc159f3fe2ab0074ee5685bcfa65ac095038a03e49fde675c42308a52b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 5612 bytes
font_01_sfnt_off00007617.bin
51d062fac6e04e606bf906ff785db5f33d4822784f33bd515784335e6f48ab60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7617 9724 bytes

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