Malicious PDF — malware analysis report

Static analysis result for SHA-256 442d1691bf23e592…

MALICIOUS

PDF

62.8 KB Created: 2020-09-30 01:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: ee24f91f0fd65a80b4f4a606deb45ab9 SHA-1: 509a9c0473eab86cc6945c4da89a6b023320a091 SHA-256: 442d1691bf23e5922070121ca60c1605a95b9888fdeffa2c170c6fc3008485e9
194 Risk Score

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://ggtraff.ru/strik?keyword=organelos+de+la+celula+vegetal+pdf In PDF document text
    • http://files.ufequestrian.com/uploads/1/3/1/3/131381109/8291039.pdfIn PDF document text
    • http://jaxibexe.truckelele.com/uploads/1/3/0/7/130739629/nafanegizedor.pdfIn PDF document text
    • http://files.jamie-thomas.com/uploads/1/3/0/8/130814189/jesipujogu-joboponok-nizadaxekujaju.pdfIn PDF document text
    • http://files.ramblingsofthepen.com/uploads/1/3/0/7/130739699/xiwakevivupivosibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9702/1854/files/amallia_action_logement_grenoble.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2158/8888/files/gezuwuzunekipibopupezifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/wumifovofilugoboz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7863/4657/files/zoxegizesif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/18823418873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/28403792064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/kawopewolagavom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/cambiar_color_letra_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/wonititilenitajamit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/change_to_word_docx.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3845/7508/files/algebra_2_assessment_book_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/interpreting_ecological_data_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/zixidezajavimibigunon.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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 5412 bytes
SHA-256: e79fcd39b930e96077a26b8a2e60f155b3535e3bede0c9528177f13245573c48
font_01_sfnt_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 11600 bytes
SHA-256: 04d9e15aaf198a21bf5e65259bc84a031ac64b6d0e981870d72e85c4fdef11d1

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