Malicious PDF — malware analysis report

Static analysis result for SHA-256 1737cbef097de5f9…

MALICIOUS

PDF

35.8 KB Created: 2020-08-29 12:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c052ab937998c3a0063e5a5c27fc3aee SHA-1: c4ef31d089219cd6fe83e197e8c849ead8b4e99f SHA-256: 1737cbef097de5f99e879c9fa3e448e8ff5fbcc94dd62ed468e1f015dac91b72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to PDF files hosted on Shopify, a technique often used for SEO manipulation or to distribute malicious content. One of the embedded links points to a redirector URL, ttraff.com, which is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains what appears to be a URL, but the primary malicious indicators are the link farm and the redirector.

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=pedro+lenza+direito+constitucional+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1143/8752/files/muzirim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/weapons_nuclear_throne.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/rijujodidubaxok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0880/9384/files/92085082916.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/sugugafagajina.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/44451946088.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/necrons_codex_7e.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/15892951918.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0746/files/69658127818.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/detroit_lions_injury_report_for_week_6.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/tour_guide_ne_demek_trkede.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0004/files/lagu_d._a._n._c._e_trolls.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/90829212338.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/fundamentals_of_physics_extended_sol.pdf
    • https://cdn.shopify.com/s/files/1/0439/4965/4184/files/88257936386.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd228b7b8a34489880d51d81f03bf33.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d0dcc6942254291ad08b1dd63b43c85.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004947.bin
a2dd06c915862a49c498237ae8d3e70f725e2fab6c98d60b455f05e686f552d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4947 5504 bytes
font_01_sfnt_off00005c0c.bin
3a972418d861112774d1f819c89e9d61c0693df49539e08ddb0bab082e7d3865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0C 12248 bytes

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