Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43773fede4e3bdf…

MALICIOUS

PDF

51.5 KB Created: 2020-10-15 16:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 197c2ca9697559ed0f60588773844d0d SHA-1: 80a34bc08787589ddb41a8c6e1ad810addf0effe SHA-256: c43773fede4e3bdf3c1bb5201eec4168539ab890b8a0d58449d2e21d27a252f0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to medical conditions and the tool used to generate the PDF, suggesting a lure for SEO-based link farming. The ML classifier strongly indicated maliciousness, and the presence of multiple external PDF links points to a campaign distributing malicious 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://gettraff.ru/123?keyword=candidiasis+en+hombres+pdf In PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/dobot-suxef-tujumev.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/mivapumanorisu_zasevile.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/501737.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
    • https://site-1038705.mozfiles.com/files/1038705/nikujotuvesekogag.pdfIn PDF document text
    • https://site-1039253.mozfiles.com/files/1039253/80788553600.pdfIn PDF document text
    • https://site-1043878.mozfiles.com/files/1043878/fezuj.pdfIn PDF document text
    • https://site-1042968.mozfiles.com/files/1042968/zepaneninivirodimefomis.pdfIn PDF document text
    • https://site-1048574.mozfiles.com/files/1048574/78195822185.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/senenekowoxexizilovazaxij.pdfIn PDF document text
    • https://site-1039757.mozfiles.com/files/1039757/gokirupewurawejisopisupuf.pdfIn PDF document text
    • https://site-1039948.mozfiles.com/files/1039948/piziwulibagub.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/1/0435/0862/9659/files/hp_15-f387wm_motherboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1907/5221/files/zepawajovolimidujawoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0588/6620/files/ragnarok_mobile_leveling_guide_high_wizard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/83611318771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7679/1719/files/suzuki_violin_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265a85c2-ff5a-48a6-8a71-b72f10fca1ef/35337308416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98600a5-b2f6-4f68-b960-9f109e0b7ed0/fodalupijumob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ad727d-2b88-47d6-89c6-7600b4042dfe/88690387572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/70287023082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/mixtures_and_solutions_worksheet.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_off0000889e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889E 5296 bytes
SHA-256: 749e45d8a71ccfead8477806258ed240e13554eaa58ecf0ffb5639474ad0f578
font_01_sfnt_off00009a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A67 11544 bytes
SHA-256: 23662587930f07dca4e0c8b7bf777b80c294303a1124b13a3d7cb7553922da97

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