Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64897d69eb55de2…

MALICIOUS

PDF

43.4 KB Created: 2020-10-17 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28b8c7ac419935212d407b9b98b07dc4 SHA-1: 16347c6b9301cc425a12377f0e61344073cf790e SHA-256: d64897d69eb55de2d824856badb452a10728d09037669dcb1faec0375dd27433
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading software, further supporting the malicious redirector finding. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://ggtraff.ru/123?keyword=android+studio+sdk+download+linux In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f897fa7922bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f8a69359166c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f889c810701f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f87636035d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f899b6023eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f89fb8e1f0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f89015a28687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8a1ca7659f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f8a115a22a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f89565831ae1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42abfbf-2981-41b5-bba2-f76433cef7ca/78809083893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a2df14-d2c4-4786-9139-3d3485024982/lewojiwunosalafeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1010ed-6474-4865-b69b-cab252bd2184/mirexit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226bb068-521a-41eb-8a17-8e4f25fcb0ec/2384610908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc513910-6c9f-4e45-8053-6e57c5687b01/70923502065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afc7f3a-898e-4081-9402-8b0348d5b9b4/2270476655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4312e9-baef-488d-85c0-3f4d1c3e8a2c/11966287588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9731/2424/files/serpent_and_dove_fanart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/national_floors_direct_vs_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efe1b7d-86d1-49d0-81a2-28e20e676e8f/79481170732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804f00f0-f69b-4405-88cb-fb5adb50034d/47176324210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c8fb9-5c7e-429d-af51-53c3cdc01adc/75419134497.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_off00006bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 5032 bytes
SHA-256: 2f677547d79d6af59641161ba4f2e8e8315a495ae4f4656d2758481ce4751dc1
font_01_sfnt_off00007cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFB 10496 bytes
SHA-256: 9323d8598063d0aece7bd3728e097f36dccedb74f247d472f42afa5c2d10872e

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