Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d946391d0d139c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-03 07:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4999442b30570b08add3701c8ffd12d2 SHA-1: f1a31aedacc22afccc22fd41d7bc386f360d8f6e SHA-256: 65d946391d0d139c821fe142a601b3c607f97f86a505272bb74a2f3ffa0138b4
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 link farm hosted on Shopify. One of these links, https://ttraff.ru/wb?keyword=estrategias%20para%20afrontar%20la%20disciplina%20en%20el%20aula%20pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=estrategias%20para%20afrontar%20la%20disciplina%20en%20el%20aula%20pdf
    • http://files.bensiddallmusic.co.uk/uploads/1/3/2/6/132681812/3069293.pdf
    • http://files.northcoasthockey.com/uploads/1/3/1/3/131384135/kopexoxerexe-lupoz.pdf
    • http://files.mountainvalleygscamp.com/uploads/1/3/1/0/131070867/zekigew-buwedi-futode.pdf
    • http://pediwop.jadoreinteriors.com/uploads/1/3/0/8/130874085/jinogelasidav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/62905980745.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/6072095585.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/gezojigosudivovisuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/rinatufeganemugifogolope.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/73593654619.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/dakigefipoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/60384960756.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/82262080696.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/fesatodixifawula.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/sakof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/33116320198.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/97240070724.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/kitagatopalozewulibofos.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_off00006223.bin
7832026d25b7697f71306e654bad0ab33d2943bc75b9953f863c9700c5842f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 5280 bytes
font_01_sfnt_off0000742d.bin
b126573fab28340077462e83995e646c3cc0a7883ceb1cc044c906cd289bc8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 10376 bytes

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