Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94466d9cea1f77e…

MALICIOUS

PDF

46.5 KB Created: 2020-08-26 15:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6282640e2e0d1485cc32da6eb2549f9a SHA-1: 96a0844e1b68f1492aba4974caae6334533f5b57 SHA-256: c94466d9cea1f77eeb8d4ba2f1ca7262248ca71b5fce7528a2c098e91a35f433
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, which appears to be part of a link farm designed to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests an attempt to obscure the true malicious intent and potentially distribute malware or phishing content through a chain of redirects. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.club/pify?keyword=ib+ee+biology+guide In PDF document text
    • http://files.wandaharris.com/uploads/1/3/0/7/130775372/ziludipifi_pobojowade.pdfIn PDF document text
    • http://files.furbabiesandfriendsphotography.com/uploads/1/3/0/8/130814209/fafofimosoz.pdfIn PDF document text
    • http://files.parkjungyoon.vip/uploads/1/3/1/3/131382595/nixidof.pdfIn PDF document text
    • http://fosusefu.millinocketschools.org/uploads/1/3/2/6/132682989/1286152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/attendance_google_sheet_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/clicks_catalogue_august_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/98718500247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8177/7827/files/storming_norming_performing_model.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/bell_s_palsy_exercises_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8556/8925/files/luxemumobuligod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/mezuroxupuxobadajuvukosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/xepatezifuwaguxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/86704636036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3910/4930/files/87728069370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/58681719233.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/90675798249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/filawotosozukoli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 4688 bytes
SHA-256: 164306b9360125dff4ac19c0aa160727706b1e1032c99b3221ef73bfba8d490c
font_01_sfnt_off00007462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 10348 bytes
SHA-256: d782be16e3dc605aa183c11762afb4107fe344d710fb5f639a5d31d337b6f02c
font_02_sfnt_off000097d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D3 16116 bytes
SHA-256: ee6d37e4d55c83e4992319dccf23001405a71c4ba88a6ec10df0eb4a652ba8f4

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