Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a18ccc7874c2e…

MALICIOUS

PDF

32.6 KB Created: 2020-10-26 05:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f950b02ebc2ef43c2f4efa49fd8d7add SHA-1: 81c956383eef480463f71b59c8792b445fa2c42a SHA-256: 623a18ccc7874c2e6000193e12fec2292b88e9a9a866e7fd58ccd9baf6837f17
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'F8 audit and assurance notes'. The presence of numerous external PDF links, many hosted on S3 buckets, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 3

  • 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.
  • 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/aws?keyword=f8+audit+and+assurance+notes+pdf In PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/tefosona.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/4994528.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/ff511370070.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/susopuzupure/37009297994.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/jobezamirepinomex.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/sopijile.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/prentice_hall_physical_science_concepts_in_action_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/history_of_indian_independence.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/yellow_belt_lean_six_sigma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4892dad2-9ab1-4c2f-b739-588fa23858a8/push_and_pull_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10afe3d2-06c6-49c5-bce4-5c38309687fd/40215092274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e79fa3e-da70-4940-b512-1366099717a5/pimoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce174cd-3c24-4433-ba13-a5ebf51efe21/7196412505.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/68444216196.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jolibu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lexical_relations_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/apnea_del_sueo_del_recien_nacido.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/rosubagavedukonozusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4756/7003/files/solicitudes_de_trabajo_ejemplos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6525/2253/files/20725038950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1503/9908/files/motion_to_quash_service_of_summons_for_lack_of_personal_jurisdiction_california.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/65264702447.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EF 5148 bytes
SHA-256: 31dc197525b9c3ddaeccc6630819cf07577dcbc916ca5589f31f8e2fec634e89

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