Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb6d3b8fa3f881e…

MALICIOUS

PDF

128.5 KB Created: 2020-10-28 01:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 15f9dc1fb48b67a96174fa60322d4533 SHA-1: 3746f36ddcf0f6c1c2871b19bc24b7aa61f4fd17 SHA-256: 8bb6d3b8fa3f881ebec22231f6a43378914f7c9324079ec06542a53bd478ba2b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=malcolm+x+accomplishments+to+society In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5f97f72370e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5f97dde7440a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f903b6e3e35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8763a58f4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f95bb4a2a1bb.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/c472f401b85e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/83726941.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/radical_candor_executive_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/71272288855.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/chemistry_matters_textbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/personal_finance_chapter_5_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4222/1461/files/64319077995.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5801/8472/files/ac_stop_leak_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/zoxemajegipusiwolimaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/98365297505.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/network_layers_and_protocols.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/self_defense_techniques_books.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fenimivoliderirido.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/autocad_2d_and_3d_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0286d9-8d2c-4661-a9ea-d4098850b149/daycares_in_strongsville_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f281397-60dc-40d2-9ad4-a6f939f01e2a/samulepovevedow.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001d6b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D6B0 18356 bytes
SHA-256: 514ba7c184911e031f4158504be633ccdd6d3c513d30e8e7e31f611f0df4e74d
font_00_sfnt_off00019be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE6 5252 bytes
SHA-256: c7c573eb2ff9a1f05f3ee5baf01eaeba2e1267de7dbdb62b6c7738ab4798a0d3
font_01_sfnt_off0001adb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADB1 13048 bytes
SHA-256: c8615042b585afdb05c805b795232056c56e748eaca5131726f9f99ef7a740cc

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