Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be53538f650b236…

MALICIOUS

PDF

50.8 KB Created: 2020-08-29 17:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43d7b77431351b2eeb3f67a98ee4d45 SHA-1: 5db8f8a95595d6e8e68372eeb08d5b55ef425051 SHA-256: 6be53538f650b236e0312c5081029efac858df44ea99edcc91d9689b472c4998
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, with a significant portion pointing to Shopify URLs that appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=ff9+eiko+cooking'. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a malicious intent.

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=ff9+eiko+cooking
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/dowuzabeguvil.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/xuvisakozonatejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/nabuvenovewetilotadoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/adjectives_worksheets_ks1.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/kepaninuvibozonerosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/business_english_for_esl_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/212609942.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/82249549668.pdf
    • https://cdn.shopify.com/s/files/1/0433/7657/4620/files/78602394471.pdf
    • https://static.usrfiles.com/ugd/b8c837_51c9bea7256843c986a30719e40de5f8.pdf
    • https://static.usrfiles.com/ugd/dd4472_8bacfd7ceba74396a777dd1e72ba3fe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_08fbd5b9431e4dfbb9b472a198dd8d3e.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_a1191718bc704b38a70e5ec9f409f695.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_off00008b0e.bin
bf1d0a5613b3bdd37d152f81e5f5d89c48c5750b93022e77f7331a203a457704
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 4708 bytes
font_01_sfnt_off00009b3a.bin
917c637b6c0b6898d8820154d89e9a4e0309eb667fd71085dc7a26ce002aca3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3A 10416 bytes