Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38c11c1a7dead73…

MALICIOUS

PDF

44.8 KB Created: 2020-10-26 10:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 120143fb3106c5db29db97af4ab4b455 SHA-1: b1e966f59d762cf1f8f23f4d473cb69b23375e4e SHA-256: b38c11c1a7dead730818deb615e96a025bacc8b21027f9b3aefa767b276ae5a9
134 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 that point to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body text, though heavily obfuscated, includes a URL that is also flagged as a redirector. This suggests a phishing or scam attempt designed to lead the user to malicious infrastructure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=mechanical+comprehension+test+sample+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5f8eb959ce4e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f8b76262f2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f8df2ca8e1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f927aa548373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f88d0ac530c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8732537ff1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f8ee13b0e6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8cc177a5a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8d2e82a6598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f95764d372a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8bedff9d521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f94750e95085.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/woberiz/cfa_level_2_syllabus_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/runifitov.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/questes_poderes_da_administrao_pblica.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/animal_names_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090ffab3-6d2b-43d6-b826-b54782e7e564/zuviligiwixuvufajikalozar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1bd87f-608d-482f-82bc-aba9794760b8/72482283534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae4469c-9271-4596-b9f3-c83ceeba2623/need_for_speed_2015_best_handling_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e16a23-2dd6-4210-9a55-129f0b223c76/jugokal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d3105b-fc2d-4914-a421-b51233f39ca7/mojozibepapivuwotulab.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_off00006cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC5 5400 bytes
SHA-256: 8abf409a3aa343e49a4cde4f91ed5d85bd7246a2a2e75029256149958d263c34
font_01_sfnt_off00007eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 11812 bytes
SHA-256: efb4b412ea623221191a6cbd92a6a2cc5a25f0004289d23586837192387581e2

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