Malicious PDF — malware analysis report

Static analysis result for SHA-256 05944757b731035c…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 20:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 435b9fbd800aa489d82d5bb923679e72 SHA-1: 3737390d71b6eaae7ab7f993ad409765c5c545f0 SHA-256: 05944757b731035cd98b1aac4488086bf9789bb479a54819ff060643762d3ab1
134 Risk Score

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://traffking.ru/strik?keyword=free+act+prep+study+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f95c4bc54fd9.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/8701171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5f8fdc055c91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f88c8c4efc18.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/b61735.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/nowokil/subtracting_rational_expressions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876e8495-a06a-485f-b749-b4cf61d16273/39999273757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7446/4160/files/oyster_bay_high_school_athletics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/suwiwixavalivozalonigej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743ffb37-3f94-4906-877c-5d880044baac/lo-bak_trax_spinal_traction_device.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/39611667169.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/two_column_proof_answer.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_off00006155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 5348 bytes
SHA-256: e86beb271e687ef5a9c58bad0f6326290b2262d7593bb262e1ecc05fd678fe61
font_01_sfnt_off000073a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 10252 bytes
SHA-256: e3fbdefae8596faf454c40bb12e94dfa41e71a09bb09e940ae200e12703e3928