Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ec39d4e88ad545…

MALICIOUS

PDF

54.0 KB Created: 2020-10-05 06:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ad76a7c34ea9d301f549662a83c1551d SHA-1: e0c2609950b2de89ff5fb1b16f55b07770a6b985 SHA-256: 51ec39d4e88ad545125cb4aa09d0aadd222198111328f7e3955eb0d43b69c6bd
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=caryl+churchill+biography+pdf In PDF document text
    • http://benuwo.houseofhoneybeewigs.com/uploads/1/3/1/4/131407158/1b93e97.pdfIn PDF document text
    • http://files.covingtoneconomymeatmarket.com/uploads/1/3/0/7/130739883/tejusuzo_mipuk_wisudasi.pdfIn PDF document text
    • https://site-1038622.mozfiles.com/files/1038622/7150242762.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/ruvepe.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/1/0484/0420/1640/files/liver_or_die.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2722/4986/files/new_order_the_perfect_kiss_bass_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6962/9350/files/john_dooley_elementary_school_chickasaw_drive_henderson_nv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2586/1274/files/laporte_county_health_department_michigan_city.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3778/8840/files/san_mateo_theater_times.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0849/8591/files/suzukowogapare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/24247409956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/one_punch_man_hentai.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/81093255793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/renasutan.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_off00009631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9631 5388 bytes
SHA-256: 62fd695275fed58d08afdd4cc4e07a578e540444a7b609f13dcc0fb56b4a6702
font_01_sfnt_off0000a880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA880 10076 bytes
SHA-256: 2a2e2fb80b66cb994cc6343355ed60627a33881b0752527b457aa4078bd4bfc7

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