Malicious PDF — malware analysis report

Static analysis result for SHA-256 120ba9374b3da946…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 13:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b06f42c4d68cb177053311f5931bf71 SHA-1: a82faf86530b8575bf0bcb35de48387add1b10b7 SHA-256: 120ba9374b3da9461ce5376465dba2d78203fe27add49619f598463e6e94c887
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links suggests an attempt to drive traffic to potentially harmful 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://ttraff.ru/wb?keyword=iso%209001%20version%202015%20afnor%20pdf
    • http://pagusede.dermatagespa.com/uploads/1/3/1/0/131070598/5486126.pdf
    • http://files.arielzylberman.com/uploads/1/3/1/0/131070051/jepatopo-dalasuripol.pdf
    • http://files.acuityhearingsolutions.com/uploads/1/3/0/9/130969183/nonaputuxi.pdf
    • http://xujane.markkowaleski.com/uploads/1/3/2/3/132303382/ec54a3.pdf
    • http://zusijibox.dawnamberknight.ca/uploads/1/3/1/4/131437792/pojamajem_bufiv_suginabexixod_sipovipikosoxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/risc_in_computer_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6962/files/26511862230.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/tikonaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/agamemnon_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/xikijebusepakuxuruvota.pdf
    • https://cdn.shopify.com/s/files/1/0438/1674/7170/files/prentice_hall_reference_guide_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/78302154513.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/jotadib.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/darurekuxadapazovikenefo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f80.bin
0b1e6c860335fab0df96ee8bbeac7592a6a59ce02fd8277f95c76ffa62e59474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 5608 bytes
font_01_sfnt_off000072a1.bin
c9aa9040960c6d554a24cc76a21f9b86cd6162a6a774fab754e65aa976e6f64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 10820 bytes

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