Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb20780211beabf3…

MALICIOUS

PDF

42.6 KB Created: 2020-08-29 05:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22065be9ea0222f31607db591bfc9cf4 SHA-1: 635c41e677d681ceba4dc0030386eb1cf283e480 SHA-256: cb20780211beabf3dd0ef5fe1fbe4000d852ed2832651d883f727614b141dc65
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to appear legitimate. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is disguised as a search result. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious infrastructure.

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=historia+de+la+gerontologia
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/el_liberalismo_politico_rawls.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/4281694529.pdf
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/bozenawulijavidefopo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/pikoroza.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/mivojemawuxeragoni.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec97949417784b42addb4dcfc33af21e.pdf
    • https://static.usrfiles.com/ugd/b8c837_afe367ecf4234bd88a9debb35fa7dd6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfcda2e4e5bd4a3d8b7503cf0da89f99.pdf
    • https://static.usrfiles.com/ugd/b8c837_977adc60b07240288fd79a58c919da70.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/98972564711.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/mosat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/59376273447.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/zorujoloxozubinopiwa.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a04c6800a3d42cba81c15989a73913a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f240f904d63b4e2a9bb4ad43d02fd65f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a7b5481c35146aba65296ebdd191c79.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d0e5eec7444aec95b8c0c306ace257.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_off00006862.bin
a39c6753922a4c020b02de6bf5e167df6c0f64ef47030b191ba4055e944f10b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 4956 bytes
font_01_sfnt_off0000793e.bin
a957e3c477914dd2eed877dca19b08d18a6bf1d6b904bb0adb3b37797abf799f
pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 10728 bytes