Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc67bd8405ef1a4b…

MALICIOUS

PDF

43.0 KB Created: 2020-10-07 15:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b4c6c0cdd60b3539eb23c37523e0cbbd SHA-1: a93c842ac44830f5c45c011e7a3b02c7c988af39 SHA-256: cc67bd8405ef1a4b688537cf3d99798654ec95b4a6b9560f3a0aacefde4207c3
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=apio+propiedades+medicinales+pdf In PDF document text
    • http://files.nouksterstudio.nl/uploads/1/3/1/3/131383407/nibega_katosubomufokog_jigiponakobo_rejevitoko.pdfIn PDF document text
    • http://files.ricardosiller.com/uploads/1/3/1/3/131398504/8372628.pdfIn PDF document text
    • http://vuxakef.serv4all.org/uploads/1/3/0/7/130739038/buwelovomemuxofed.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/1/0484/5466/4342/files/what_do_baby_cows_eat_in_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/8712/8485/files/sadlak_spring_guide_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9723/4338/files/zidubibaruvedoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/rodeo_stampede_apk_cheat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6411/8433/files/misty_island_rescue_us.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3620/5479/files/need_for_speed_hot_pursuit_apk_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8357/0078/files/38630733571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3296/files/11978091087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/girl_scout_outdoor_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e24f8b4-eb52-41b1-be34-255fbb28d83a/46483593916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff887f7b-148b-429c-8d73-9cb675de0b95/93899606947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099ac1ac-dd45-44ac-9fd1-9419657c8a64/polanifolur.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_off000067bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 5288 bytes
SHA-256: 01c18e74d1daa61ea640ceb0d7a96ae59e227e421a22df3cd251317085095798
font_01_sfnt_off000079a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A3 11100 bytes
SHA-256: fdf14dbc565f2f00cca72a568625e50f025658e818fa6aa2417b155d960890af

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