Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92d2898be98a46…

MALICIOUS

PDF

61.1 KB Created: 2020-10-28 06:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e55861b6ab106256b54fc120b6b4bcd SHA-1: 98b34528aafd905c1f1d38f03666369f256dbcfe SHA-256: 8f92d2898be98a4600b9e8973452d8cb696f1045df24256fae0504127a76ac79
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=kindergarten+activity+book+pdf'. The document body, though heavily obfuscated, contains text related to 'Kindergarten activity book pdf' and the same malicious URL, suggesting a lure to a malicious site. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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://cctraff.ru/strik?keyword=kindergarten+activity+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8a6fd33dfe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f875228dbbab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f93f328152dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8f4bd872fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86f85e5fd3d.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/7357332.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/zigij.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/7786ea67fc811ea.pdfIn PDF document text
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/tagarubomuxen_farezoduxuzeta_fabekam_nopedujuvopejav.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/1/0504/5197/2273/files/rivulesegojelinefisigude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6937/4115/files/jokijigolafekorapajefok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9479/3110/files/wujofugizubaxexav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/13348842625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4833/7059/files/vujanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/como_hackear_wifi_con_android_root.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4195/5221/files/71050162817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8688/1988/files/string_or_binary_data_would_be_truncated._the_statement_has_been_terminated._entity_framework.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/4.7_practice_c_geometry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/jusogadimekareruni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3071/5805/files/guided_reading_activities_year_2_tes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1859/8558/files/74056659135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6424/8470/files/29454663390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/tommy_girl_perfume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4182/3164/files/44917504061.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_off0000af26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 5448 bytes
SHA-256: c5bb072e55852bc30f4e4843686ed163d6e5d56deec166896a174715c056bab7
font_01_sfnt_off0000c1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BD 10980 bytes
SHA-256: bb71ef8bd6cbf458102301995c8956a3a1b6f363781b8d3de6988296cda1e5c8

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