Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f601d31856ce9a…

MALICIOUS

PDF

39.3 KB Created: 2020-10-25 15:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5c17682a77b2ff6d35552926ac63b12a SHA-1: e5a5ed2bdde0dd6e69b99c6751e5dc78f7f1b5ee SHA-256: 95f601d31856ce9af50447b73288c1719172e04f7beff2b2eea39693fcc64837
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external resources, many of which are identified as malicious redirectors or part of an SEO link farm. The primary malicious link, https://gettraff.ru/strik?keyword=javascript+the+definitive+guide+8th+edition, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking through to potentially harmful content. The presence of multiple PDF links and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?keyword=javascript+the+definitive+guide+8th+edition In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/up_b._ed_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/watilujadokelil.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/farmacos_anticoagulantes.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/pdf_file_editor_free_download_filehippo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/wiguzuniloteza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6109/9682/files/creative_writing_year_4_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87d1dda-41e7-40af-a4e3-9fbe245ddc24/naxizolara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5407704-b6ab-4a6f-8cd8-2c75bcb428fb/ultimate_facebook_hacker_3.5.1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/16785681283.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/active_listening_building_skills_for_understanding.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/24116364056.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/febuvezavosuvowibisiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/77267314342.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/72546249583.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/akreditasi_universitas_ugm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f2b42a-c222-4554-8719-eed990d4610b/dan_carlin_book_recommendations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b427e94f-0dd3-41b6-9ee1-cf222fece631/gakemowajewikotowuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26a1973-256b-4e1a-ae9f-1ebc8e0bd39c/6209471092.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_off000059fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FE 5628 bytes
SHA-256: 8c80730c01ff9ee0021a1d38d32c25179e926410fb881e5e6e2e3e5c05ef5210
font_01_sfnt_off00006d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 10140 bytes
SHA-256: 483b7d7711a97845de243c0ef203fb6eb0bec3e3845bf06800e74dfc2caef76b

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