Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea691a1c5d317ad…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51bd6a58bbb6c199ba90e729967492b SHA-1: d43cd6b5f006f7582991af175e07830fe255e087 SHA-256: 2ea691a1c5d317ad7deea44400d2487378134adcc50dd471ee8ae93a1185d38a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as workout information. This redirector likely leads to further malicious content or exploits. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=full+body+workout+for+mass
    • https://static.usrfiles.com/ugd/824332_5264e541087f41f2883b3a102e230ac1.pdf
    • https://static.usrfiles.com/ugd/cc14e4_dbc6de1d352c41d187704b643dab0497.pdf
    • https://static.usrfiles.com/ugd/b8c837_97bb5a741a0e419a82bba4f1c117ca3a.pdf
    • https://static.usrfiles.com/ugd/238140_55f89dafe793485c9266bea423c57530.pdf
    • https://static.usrfiles.com/ugd/0aab01_628ac618dd654a6c8a8baca6b9d29834.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/rebopin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72619586694.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/91738966320.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/warabavetodomosobezog.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3635/files/script_fonts_free_2017.pdf
    • https://static.usrfiles.com/ugd/b8c837_407ae5d3df014a7ea237ce441e1e32eb.pdf
    • https://static.usrfiles.com/ugd/097bd5_b3c6821e5a6b48b6b2b417348f52e528.pdf
    • https://static.usrfiles.com/ugd/9e14ca_c2858c72036946f2ab2149da657bec1c.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/95333011156.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/selebuwo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/39973041272.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/expanded_notation_to_standard_form_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/47490797499.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_off00006b0a.bin
2a01664bead850dfa29bd15d260d62607eb961ab78ccc8918450f4309611eacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0A 5016 bytes
font_01_sfnt_off00007c24.bin
c73b77d004e6cf839e8384f7a33a38abbea16db581e3a72df297d37533955f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 10488 bytes
font_02_sfnt_off00009f77.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F77 4324 bytes

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