Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc1f455dd95f605…

MALICIOUS

PDF

37.2 KB Created: 2020-08-29 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d365e1d071da7e9f66742d301a72ca12 SHA-1: a513c7b69bbe7b36ed044b808a3d355d84c6cd62 SHA-256: 9bc1f455dd95f60530aa1900588ec35a3f50a3071aba4038366536d722c389ab
154 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple embedded URLs, including one pointing to a known malicious redirector. The document body text, though obfuscated, appears to reference a 'wearever pressure cooker manual' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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.com/wix?keyword=wearever+pressure+cooker+manual
    • https://static.usrfiles.com/ugd/b8c837_74e0458252074051bff3d1f92af7861c.pdf
    • https://static.usrfiles.com/ugd/12dc78_a7e449fbd7294693bfd94bbb782fc0e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_45d168df0d544de6a846328f3b998d86.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e24c6fa2c754dc99b2900516f28e6c8.pdf
    • https://static.usrfiles.com/ugd/63d3ad_68bdaa1186834dd58743ee9fd049f161.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c00e3fd763d49aeb52b56d4275fa331.pdf
    • https://static.usrfiles.com/ugd/7baf93_bd1feea018ed429b8be83b132125d7f0.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/33652538125.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/82038277908.pdf
    • https://static.usrfiles.com/ugd/c7a620_c165dec738ec43cf938d412bc22ee578.pdf
    • https://static.usrfiles.com/ugd/de02f3_9c847aee5e1345628c363e63d7a5fabd.pdf
    • https://static.usrfiles.com/ugd/b4609a_6c485e3bd72241ad92395177f245eaa5.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_off000052d4.bin
f169e3ef6e36d4d25382f67e4503e60d69c2e23f12843558ae4e895a62f8fad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D4 5216 bytes
font_01_sfnt_off0000648a.bin
8f5145af9b784918045f5e6d4726c411baa2d73a82c54dc54485879d07a0db13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 10484 bytes

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