Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b19ff8aed137bf…

MALICIOUS

PDF

45.6 KB Created: 2020-11-01 13:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e2cf80c093c38eefc2d7197f2ed2c93 SHA-1: 99f9cab6fac640716265c0db09f90b3f24ae9dc9 SHA-256: 59b19ff8aed137bf242f95fc30ec05164ea7dcdfc401b1e901ca148342013f37
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=drunk+fu+unblocked+games+66', is identified as a malicious redirector. The document body also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, as noted by the PDF_SEO_LINK_FARM heuristic, indicates a link farm strategy, likely for SEO manipulation or to distribute malicious content. No scripts were extracted, but the ML classifier strongly flagged this PDF as malicious.

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/strik?keyword=drunk+fu+unblocked+games+66 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5f973c384719d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/dapokivujalomamuzazamevi.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/junction_city_firestone.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/zorewex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3d327a-515f-474e-ab82-a9840e6f4e5e/acid_base_properties_of_salts_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/xubojelaxalanog.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/31275244068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf7460a-0cf4-49bb-823e-dabbd79de4e9/attack_on_titan_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ca16cc-cbe9-454a-90b9-047d3072fc85/derivative_formulas_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfb0e6b-fe63-4f60-8824-3f1cb7a9ae5b/lovib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ea67fa-c624-4567-801b-f2f67e4c9b3b/52981123640.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/british_english_and_american_english_words_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6569 5452 bytes
SHA-256: 92bcf3f114aa729a51f8114ad48ac7ec4c807cc71a288a5f8ba3c52341449479
font_01_sfnt_off000077d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 10652 bytes
SHA-256: 21ade3f281a71e49889d1cc15f3452df2183c1111b6d5f94bdf3c005946f9698
font_02_sfnt_off00009b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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