Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed2213c27ad17f4…

MALICIOUS

PDF

54.8 KB Created: 2020-07-28 07:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1858e6093d90ad8195990c1bd9b17aa9 SHA-1: c068f15d9660df752c1a33410c534c623fb48959 SHA-256: 4ed2213c27ad17f4d11c737133fa22f64433945fc31ae6d18f37012906d42475
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, suggesting an attempt to lead users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

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/pify?keyword=alexy+teoria+da+argumenta%25C3%25A7%25C3%25A3o+jur%25C3%25ADdica+pdf
    • http://files.otodea.com/uploads/1/3/0/8/130874489/9577896.pdf
    • http://files.esoterichealing.com/uploads/1/3/0/8/130874541/2045388.pdf
    • http://files.ianglassfitness.com/uploads/1/3/1/8/131857305/wuxexax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/buxigol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0695/files/37084960476.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/pojiropefil.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/57760586871.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/20278455178.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/81914328150.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/35657533824.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7520/files/pinadewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/zixulokuliv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/69497936208.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/67900219528.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/fizajukifajutesij.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_off000094ea.bin
a01c0e3e09760812f5fca6fe7a7d72ade3252d893973ef65d91f1f61df6b6513
pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 5968 bytes
font_01_sfnt_off0000a859.bin
975d70de4cd509c6f4c6ae1237daad5317c72dbb3f873284a209b3b1490a5276
pdf-font-stream PDF embedded font (sfnt) at offset 0xA859 11604 bytes