Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b3baf35cb2f7c…

MALICIOUS

PDF

43.5 KB Created: 2020-10-05 04:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: eb612df2eb1e3c6c964b2147fd539bff SHA-1: 77285451bb486c51a6b6d52ed2c5cdb62da308f7 SHA-256: bd4b3baf35cb2f7c172e15da3622890e89e6d37d7c4e94413844f6cc5344abb7
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://cctraff.ru/strik?keyword=phir+bhi+dil+hai+hindustani+movie+song+download In PDF document text
    • http://fulufu.theretreatcommunitiesofco.com/uploads/1/3/0/7/130775830/dunasanavadorik.pdfIn PDF document text
    • http://files.katyasadoff.com/uploads/1/3/1/3/131398224/lipewazuriguz.pdfIn PDF document text
    • http://files.mrsdownsclass.com/uploads/1/3/0/9/130969944/3749130.pdfIn PDF document text
    • https://site-1039273.mozfiles.com/files/1039273/kawifezuxek.pdfIn PDF document text
    • https://site-1043559.mozfiles.com/files/1043559/83297423587.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/1/0433/2158/9913/files/60370162646.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7601/files/xukebagoziv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/kesipupegexojakiresev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/jasc_paint_shop_pro_9_free_download_for_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1798/4410/files/tirujosivolavesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8566/3908/files/jotexebowegaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5788/4565/files/imitacion_de_cristo_libro_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/la_fitness_center_laurel_md.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/depunotatotonoletojem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3842/9343/files/natural_selection_virtual_lab_answer_key.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_off00005e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E46 5532 bytes
SHA-256: 933608114315d0e675d1e23600465552dcf1597ad8803bdbcc39e1dbeb89e957
font_01_sfnt_off000070fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70FA 15256 bytes
SHA-256: a11097c1702470db91a5afcabccc528cd8cb16219186a9514a58b4943d0ec61f

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