Malicious PDF — malware analysis report

Static analysis result for SHA-256 6549ad87d318030c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 12:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de4cb3fa8454e967584451b1c1e4c91 SHA-1: 5a749aae0766a563ccfabf7ff02cea8bb88778fd SHA-256: 6549ad87d318030cd68a93d579d6c9f9fd20ba508e759efef6285d77e26cf08b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, but one critical link directs to a known malicious redirector. This suggests the document is designed to host a link farm, potentially for SEO manipulation or to distribute malicious content via the redirector. The ML classifier also strongly indicated maliciousness.

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=wow+archeology+leveling+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/46786580818.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/73228814096.pdf
    • https://cdn.shopify.com/s/files/1/0437/5301/3409/files/electronic_library_resources.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/telecharger_larousse_orthographe_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/civilcad_gratis_para_autocad_2016.pdf
    • https://cdn.shopify.com/s/files/1/0459/8982/2631/files/18722361387.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/rinigofubukav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5311/files/political_map_of_europe_blank.pdf
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/wakifixamuximapagadodavoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9640/files/38243694453.pdf
    • https://cdn.shopify.com/s/files/1/0463/3853/9682/files/flask_jinja2_render_template.pdf
    • https://static.usrfiles.com/ugd/3e9e83_c7efcacda25f4115bc4f1ae6e935fe65.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_32b2690d902541ff845eb29456246d2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_616489f646b44c4f97f250f1b4d87860.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_off00006644.bin
ead9d44f93ea68d60fc4655c79befff1a3e856d592502dc8d9367335f6c830c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5292 bytes
font_01_sfnt_off0000785b.bin
7ca9c1e14f9f19b39dd4b146b3871a32b39315f0512f0a0900e097660528e7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 10300 bytes