Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbd9266b8022839…

MALICIOUS

PDF

42.7 KB Created: 2020-09-06 08:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66cd2aabafde456bf8952e4f792909b2 SHA-1: 31dd178ff8d2da84b87235b1be81e54c5d9513cc SHA-256: 1cbd9266b8022839465bae95a204431c0edb8455b66d5ca005a79e954aeffc4b
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, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to malicious sites. 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.link/wix?keyword=facebook+logo+png+format In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_fe4d156699cb4103ae10e8fb5e5bc39a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70c1f8_7c35dae6de704bf594613d232756d05b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3bcfef_463aa5260e2c4ee1ba089da60b4741f3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c9f6869b972445329dbd2fbf0133938f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee9d3f_3afce0d46dd84b1f8b9736b3df26e32c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/76b6de_461fa9a2287f4cfe9194c181fcafc395.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/956c05_5284fc49a50348eebc29adeef5505184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1991/7720/files/totuxixidono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/bioinformatics_algorithms_an_active_learning_approach_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/kisesojarovetutepemezajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/hospitality_industry_managerial_accounting_7th_edition.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_02d3e4587d254423a7fbd95ea432ab12.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_5f0e8922dfd942efa2013882555d4d27.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3760a391cc2b4da189a954bec98d68ea.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2eedf1_821f02a6fc534de59874a03fde85d9c6.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6358 5316 bytes
SHA-256: 9bd833d45925fa5a5ac607debc17f34b6fa05a22129570060f4a5dbac8891d03
font_01_sfnt_off00007562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7562 12888 bytes
SHA-256: 6889592998873a515f24d232ec5246434eff2580956e9da6467055dd5b828237

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