Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a88e25ea9bd931…

MALICIOUS

PDF

40.3 KB Created: 2020-10-27 00:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5c16f4293ecd9fd296cafb24754d49a5 SHA-1: 96fd88ab43fd85876711d694d75cda649ce54226 SHA-256: 28a88e25ea9bd931c16760670d9d2c44f4a1ee07b394e95d83e981aa82e34dfb
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://gettraff.ru/pify?keyword=john+p+gray+and+son In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9696881be1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5f9376cbaba73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f94a080257a7.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/sodujifezulojut.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/a3e53c.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/zutezumow-didebotigusi-lutenemalomug.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/1/0504/3568/6560/files/gebilogonodezinelosuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/miveriwisarigonadibep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/wefunetixizixenemewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/vukapimil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/new_general_maths_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6738/7303/files/aprender_ingles_para_nios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1728/3995/files/so_launcher_prime_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/40424846754.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/new_trends_in_human_resource_management.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/commercial_broiler_farming.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/bible_history_old_testament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c6e058-32d8-405b-99f6-c36694d81729/daxewezesopodoxero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb000ad-3f32-40a1-b757-9b4e97e79102/42473193801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfb2fb1-4734-4aee-9556-d91c0f9dcb87/5064355927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9d908f-aaa5-4a17-8e7b-ff3381fe76f7/17579370669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18762f9-8b43-46de-9e4c-ebddf41f1c3f/85438595090.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_off00005c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C82 5280 bytes
SHA-256: 980bc14ba9e9ca72832e4cfac1379176cd8abc94546bc41c5817280b0d5c5166
font_01_sfnt_off00006e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6C 11064 bytes
SHA-256: a3cc0b7ae262e258b7e0579d6ed89abbdea683cfd6b333cdaf9f601920fa2e77