Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c41375ead3b7aa…

MALICIOUS

PDF

49.1 KB Created: 2020-10-30 23:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ea6d414d8458cfa4fa958f5ca0a88529 SHA-1: 9f37a21e43562014c813b239fd220c21f693e7de SHA-256: 97c41375ead3b7aa38d6d331a359eeda49e70ea47537cfc00828bbc153fefc37
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/aws?keyword=the+emperor+of+nihon+ja+pdf In PDF document text
    • https://s3.amazonaws.com/vufupu/pidavemiparozaraketadow.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/parefova.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/xixufez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f87138d849e0.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/statistical_process_control_fifth_edition_john_s._oakland.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/60514101e84173.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/napofujewub.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/types_of_food_and_beverage_service.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/21753109047.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000830d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000830d.bin)
    • https://cdn.shopify.com/s/files/1/0501/0046/9927/files/98030639770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/ohmsches_gesetz_bungen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1037/8904/files/libros_del_tabaquismo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2079/0178/files/zefej.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 extracted file (font_00_sfnt_off0000830d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830D 5096 bytes
SHA-256: 1f42c088345a0c154b41ac59525502198f9d0f1272f5b0f9a136c3b999f39e7a
font_01_sfnt_off00009438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9438 10264 bytes
SHA-256: 04312ca09172a8b347bb6d9d31cd88fb47cd831b19de94f174db4d956ade82fd