Malicious PDF — malware analysis report

Static analysis result for SHA-256 794a54e8988f7acb…

MALICIOUS

PDF

51.1 KB Created: 2020-11-04 14:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b5b5010b25495160e59fcc80f1ee0c8 SHA-1: 84dc8868f942ec4502effb84d421798b7c1987a8 SHA-256: 794a54e8988f7acb994db8dbd0b18bdb7a54288fca94d3eab44c75c20f66fa72
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The PDF also hosts a link farm of external PDFs, suggesting a tactic to increase search engine visibility for malicious content.

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://cctraff.ru/123?keyword=roku+ultra+user+guide+pdf In PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/9570361.pdfIn PDF document text
    • https://visenapanelowoj.weebly.com/uploads/1/3/4/5/134581819/8362672.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/lutibiredupubuk-julaxakorufuj-jefonokurigun-jomovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_5fa0d42f96327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fa1ea273ccb8.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/3112502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f9647b196735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f8bcfb316bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_5f9db23c446d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c9ed5ea2-cedd-4008-bebc-e0c0e5331a8a/gujotudosexutafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7de0a4-6edb-464c-9ff3-9222fd8b8653/2810419013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5aad4d-fadc-4909-abf0-6af0d1b8aae3/18387945004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1f5e7c-3c62-4416-bda8-010a124a4aea/kutalopupamasixaximojuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 5056 bytes
SHA-256: 1ff1b55c0108401ac678d9f2b1c93f4f386e5b9e6716d25b8826e16cabe96f44
font_01_sfnt_off00008cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFA 10688 bytes
SHA-256: 134c0fedde74fba36961361eb3dbfddc6c7ffdd5bae4308f63563e85441c6acc
font_02_sfnt_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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