Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b425bfc1cabc781…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 07:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df8b8ca96a6f5a9dc39518e284f96725 SHA-1: 394523eb050ebb183a213f5615c5a064c7289e45 SHA-256: 6b425bfc1cabc781f72e158ee8bfaa95f45a6e5c5b33f3b0a3c052d8863afd41
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify-hosted PDFs, suggesting a link farm for SEO manipulation. One prominent link, disguised as a search result for 'ps3 emulator for android nougat', redirects through 'ttraff.ru', a known malicious redirector. This indicates a social engineering attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=ps3+emulator++for+android+nougat
    • http://files.ismaakarate.co.uk/uploads/1/3/0/7/130740175/ronupaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/xorod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/pikuwugupaguviveketerub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6116/files/17417831479.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/aadhar_card_update_mobile_number_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/fifazofebegosafef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/beruwef.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/chain_rule_differentiation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/camelia_jordana_moi_c_est.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/63633864095.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/puvilejiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/arbitration_act_1996_bare_act.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/flow_cytometry_principles_and_clinical_applications_in_hematology.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/36588475872.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_off00007350.bin
f330dfa1c69eba8ce8a571ed2bf34379b4b13ffcd43a5e183a1b601826445ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 5392 bytes
font_01_sfnt_off0000858d.bin
72f4e9bde323fad2763a3a27c52914adfe85d8e811441e3a389be27372d2b1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858D 10360 bytes

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