Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1a7488e50bbb8a…

MALICIOUS

PDF

49.1 KB Created: 2020-11-03 14:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8c6ff08d84b28e0134c4e5a88e28b4f6 SHA-1: d527165ea2dd2ffb9bd64c9658a7773585d26fad SHA-256: 2b1a7488e50bbb8a6aade50dad3dc3c37f35734256fd8e71a5e25129a4be55d5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=asus+vs248h-p+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f8a7e517f4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f9ad05a2908c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f8967a0410f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8fa3e00ba04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5f92aab59c1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f9262a7d245e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/turip/buvomepomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4348/6358/files/powiwixuxogosaz.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fogawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357da78a-332d-4a4c-8fb6-1f85ff51cffa/vifobupuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1397fcaf-da56-440a-b21e-9947a9e547cf/zuvixoxewerulasado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89c7e81-ca83-4a4e-81a1-0857404d64d5/55732214759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e41c65e-8366-4a92-9b83-c60a1f45b616/moxifatad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2284/3545/files/rugalurupazinowanef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd998e29-2c27-45f6-ad74-bc71bb2623ef/jekufuzatota.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0B 3028 bytes
SHA-256: dabe7c97521a3bc8cdefebb44444775986ad5d9fd98a68245ca7ea15aa4d3e51
font_01_sfnt_off000067d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5176 bytes
SHA-256: 10813591a2131acece1ea0b0441a4495b9007aed8022f9654f1a7e65fb011a04
font_02_sfnt_off00007994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7994 12188 bytes
SHA-256: e1b24496cf504d03fe20afbe6d4d905c3570e76ca21e4facb00e040ccb717a5f
font_03_sfnt_off0000a1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AD 16208 bytes
SHA-256: c4540660904b8c02014264f1be5f2dc8ebf46c2f5e8bc55ae9aead11d4fb6599

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