Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eff8a61fe12fbd…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 15:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127ed2490b3da61c7e08c3e7db15417b SHA-1: d5c2ce20b7bad2cdf6d56d0278032f892f27ac42 SHA-256: c4eff8a61fe12fbd5f4b629e941f42582ba2a06f359489e721f62194912a5337
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=cuyahoga+county+jail+cleveland+oh'. This link is presented within the document's body text, disguised as a search result for 'cuyahoga county jail cleveland oh'. The PDF also exhibits characteristics of an SEO link farm, with numerous embedded links, many pointing to benign Shopify domains, likely as a camouflage or to inflate search rankings. The ML classifier strongly flagged this PDF as malicious.

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=cuyahoga+county+jail+cleveland+oh
    • https://static.usrfiles.com/ugd/b8c837_7c38f64e06c6438f9b7e65ccef2aafa4.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_6e2b8b28a93c4e6f9c1dcd89ae7efb8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_096a88b8a2c74006887ea31637492031.pdf
    • https://cdn.shopify.com/s/files/1/0464/5073/7320/files/3d_animation_pictures_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/23049620916.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/que_es_variacion_genetica.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/vikebizamunudij.pdf
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/51516295983.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/17145695733.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/winezizaw.pdf
    • https://cdn.shopify.com/s/files/1/0459/6288/7335/files/bagimites.pdf
    • https://cdn.shopify.com/s/files/1/0433/5176/9256/files/wofazigesoluvot.pdf
    • https://cdn.shopify.com/s/files/1/0462/4249/6663/files/1984323942.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2517/files/monitorar_rede_wi_fi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/luxury_vinyl_flooring_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/nixiledifiworarenefedezi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/worememiwapa.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_off00006401.bin
f140da441aa32252a786c69f95b95e94975b18b8a56a6ed2dc6cebe50502ee9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 5072 bytes
font_01_sfnt_off00007550.bin
f710a30147fdb95822fee5ffc27e9bd881a208d25cc2df26cc6d876310a9a4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7550 10392 bytes

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