Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9356d71b1656852…

MALICIOUS

PDF

54.3 KB Created: 2020-10-18 09:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e54cb7158aae19fc94e984d76e2c7642 SHA-1: c4ba27eeb2c82755e368f5897eded488cb62957c SHA-256: c9356d71b1656852954e0b8b250c95d51ec5ce74d57537289d9496fc51df76b3
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://gettraff.ru/strik?keyword=que+es+un+sendero+de+peque%25C3%25B1o+recorrido In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/zaxekiviwibige.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/zatakipuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8710f93abef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8b90023c958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f8a5edfcf044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f87e6ed858db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f8a40a6b1c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8794617f265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8b24eb9a8cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/645d60f0-1682-48ae-abb7-117957d502c0/xujaligebinafunoruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762f4158-7579-4a5a-a7d4-ac892ceb4711/nuzesadokeruvokakezukok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/309f8285-4d94-4b5a-b06b-12d94ce77585/suvudejixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f45c66b-60ef-4c3d-bc2f-31ca092e4934/53451047625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b56584-7231-465d-aae4-d6029f99251f/vikofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/completing_the_square_worksheet_math_154b_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/jigeje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1245/5104/files/nobipojazokarasav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e48594-ccbb-4299-b4ce-b5af65913062/takekagun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8ac785-7821-40df-8477-e12c38668305/67958469469.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_off00008746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8746 5224 bytes
SHA-256: a148baa6aca8c42a4db6ed79c09387b06947c2f999ae4e33c98a1f468d14aaf2
font_01_sfnt_off000098d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D0 16152 bytes
SHA-256: 31f22e017958c525389826d61219bbf7aedf3d1436338c44e7a3d081bc1e456d

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