Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603de4a30c21117…

MALICIOUS

PDF

61.1 KB Created: 2020-08-31 09:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acca72bf72a475d65fbf6eb3dfcdc498 SHA-1: f89d6021127e64ab8591299945a951fb9f57921a SHA-256: b603de4a30c211171039b2e2893c90f2536eb8df10f0bcdfb6fa0c0a3155acea
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=dividing+fractions+song'. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a social engineering lure to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=dividing+fractions+song
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/rescinding_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/97148477489.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/lubavavokabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/bumenovug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6527/files/71300140704.pdf
    • https://cdn.shopify.com/s/files/1/0434/3457/3991/files/parts_of_a_book_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/bonair_evaporative_coolers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/vesixabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/adding_rational_algebraic_expressions_examples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/scotland_the_brave_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18396470220.pdf
    • https://cdn.shopify.com/s/files/1/0466/3934/9925/files/bagobeze.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_off0000a213.bin
83e3c6fbd35c953c322a597f54fc9137cc25f6b696f3e4df40915adad65c5c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA213 5216 bytes
font_01_sfnt_off0000b3e7.bin
fbb79ae5472cfa50a5fca796b79115ac3429c1d2227928f6f37c2ca4ea572a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 16680 bytes

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