Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfc8f8c55dd34cf…

MALICIOUS

PDF

43.9 KB Created: 2020-10-20 09:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ebf04984fbbeea21c6080f458aea973 SHA-1: e96fd24164f6d7031165da5781a9631fa1542071 SHA-256: cbfc8f8c55dd34cf172f6fbc92aae477663a96712d250766c155f91a466bfd9a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body itself contains obfuscated text and a URL that appears to be part of a link farm designed to attract users, likely to download malicious applications or visit further compromised sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=s+note+apk+for+any+android In PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/didufuwovakufupip.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/mutaloduwug-ganomidubit-zatuzigixob.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/4197128.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/477c3af4540.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/66e10c053e20578.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/a80cfb.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/944522.pdfIn PDF document text
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/2635058.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/8738a.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/pularawawa.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/vodovofigumeji.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zatasuwajam_golomadobigalib_runoje_bevoxeja.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/653de704-58d7-4136-be9f-ff701352be3f/zegebemizizufomuwebizimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e1a5d7-af16-4c27-ba3d-34441b0586b8/woruromexotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d09a4e5-7b04-4c21-a1ba-09b93fd5c4c1/rozeven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d93274d-8a4b-463b-b928-f9303da4d1ed/48272834421.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_off00006e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 5092 bytes
SHA-256: 4053ee64351cc90a36716d408994ef7f81fa06bf80871579ba46095c06fb1bd5
font_01_sfnt_off00007fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEF 10272 bytes
SHA-256: 469d75c216d28b17b492cf4ddbda77099adad004c223c1ac719ee83c93076ced

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