Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f2c7c81ef86f70…

MALICIOUS

PDF

48.3 KB Created: 2020-09-05 09:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1efade8a445d21e75fe97417bb42ac86 SHA-1: 64b79557e2f764c050cb83b7556e78a0a598f0fe SHA-256: a0f2c7c81ef86f702b4a6fb306d863f72c0e0d654601a2bac5d157ba825471f2
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely intended to lure users to malicious content.

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=sentencing+guidelines+council+manslaughter
    • https://static.usrfiles.com/ugd/6c8f37_50e54ea997264f6fb35e2b7995e1ae50.pdf
    • https://static.usrfiles.com/ugd/eb6c48_119aa32f092d476284bef36deb509b91.pdf
    • https://static.usrfiles.com/ugd/436160_21170cd7c3264509b662101c55f55ac6.pdf
    • https://static.usrfiles.com/ugd/8a419d_eabe60a27ecf471eafb9d219ea0a019a.pdf
    • https://static.usrfiles.com/ugd/3b47cb_8b33cc2b7534401b821576d47add5a9e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/car_parking_design_standards.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/sistema_reproductor_masculino_anatomia.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/89550250786.pdf
    • https://cdn.shopify.com/s/files/1/0462/0134/0057/files/36882532077.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/compress_with_dpi_of_150.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/jipikibizixurigepesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/soul_calibur_4_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/7889371851.pdf
    • https://cdn.shopify.com/s/files/1/0431/4549/4684/files/lerumizekubijirakuvew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/excel_pivot_table_report_templates.pdf
    • https://static.usrfiles.com/ugd/af0aa9_e8eb9771031a42549e858b19fa9a86a6.pdf
    • https://static.usrfiles.com/ugd/d17951_2ca6a83567ff4059afb7172da94f7394.pdf
    • https://static.usrfiles.com/ugd/9421c8_846de7340963479499f877910e5f185d.pdf
    • https://static.usrfiles.com/ugd/83e24f_b1076ac2ab104a3c9d0b68b1c45d8458.pdf
    • https://static.usrfiles.com/ugd/fc840b_9467f9c545da45f09a0ddeca4cf2c51b.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_off00007f5b.bin
937a1f185889c7992517716f09c12045f7d7b215f2d02b7fc57f54ba3e310213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5B 5456 bytes
font_01_sfnt_off000091b6.bin
7a73242aff3f333608b3cef5107fd4c99848c713665348b82d8cb0fa401f1565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B6 9860 bytes

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