Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d4dc20d8404d6a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-09 23:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a242f15ee34f88617a8a7d8b8e1f023 SHA-1: 7113059c7b1ad88a6c9e38c2a3bfc3c0d688ba9c SHA-256: 08d4dc20d8404d6aa4629e8baa5e933b500b163a6b782e5d88b22cdc4b95cba8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests a tactic to drive traffic to malicious sites, potentially for phishing or SEO spam.

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/pify?keyword=absceso+periapical+y+periodontal+pdf
    • http://files.allamericanhousesitters.com/uploads/1/3/2/6/132682790/zerevogelamov-jagulibomirudez-pexawegas.pdf
    • http://files.historyunderground.us/uploads/1/3/1/4/131438604/f340c6fb149a663.pdf
    • http://safogiwiz.paolocroatto.com/uploads/1/3/2/6/132681352/6990127.pdf
    • http://delom.horseshelpingpeople.net/uploads/1/3/1/4/131407995/c5a20368dc3.pdf
    • http://files.simplesweetskalamazoo.com/uploads/1/3/1/1/131164075/remalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/zogukobirajenafubowoneme.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/fedizoxiwumater.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/differential_calculus_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9944/6693/files/lic_jeevan_amar_proposal_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/sapunalakawikorotulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/principles_of_macroeconomics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/23198012049.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/nuzodufepogevikafofetofer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/epigenetica_y_nutricion.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/rukadu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2792/files/bufom.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/panasonic_kx-_tgea20_operating_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/15423972326.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_off000076c3.bin
82b3c152542d68afd2ff45f86bd3a9b91915d89b84ec8010413ec9230b7dc68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C3 5380 bytes
font_01_sfnt_off00008922.bin
7d99f6a9905545c4575d146fa70c71bace041856bd81fd2aaea2a2a7ad1cf222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8922 10652 bytes

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