Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8da5cc3a715f5…

MALICIOUS

PDF

43.0 KB Created: 2020-11-08 13:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 49d99657f97159f7caafa17d7e817e81 SHA-1: e97888d8b46432c38424f993cfa366f610dedc17 SHA-256: 50a8da5cc3a715f5b32962620bc55cabbbdbd00c50d4d43a82518ec1ce25d362
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://traffine.ru/aws?keyword=ny+floral+boca+raton In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_5fa06f29c159b.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/8023602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f8fecf157a65.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/4802602.pdfIn PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/gokex_paxesapep.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/4685887.pdfIn PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/1518052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/wadituz.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/bewopulogomewaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/a_practical_guide_for_policy_analysis_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c50a224-3ed3-4404-89e3-30ad4775825c/95980613755.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/a_sharad_hett_lightsaber.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/super_mario_3_randomizer_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b36d5b-5e9d-4d30-bbf8-ddc234e60d2b/the_outsiders_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/the_second_world_war_book_antony_beevor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf6c605-35c5-4f00-8c38-9ec93f17addc/simple_pickup_line.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/kofibazudivikojirifuzuw.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_off00006802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6802 4908 bytes
SHA-256: f31fd33e6ef9c2665bd8397e9fd72fcac5e07beb5fb34d454e9d95c11e20d46b
font_01_sfnt_off000078d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D4 10928 bytes
SHA-256: b1e8e985f6591d233a37ac7b7858a571f284355380c080fb6436be21a6d225cd