Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6e17616d475336…

MALICIOUS

PDF

59.0 KB Created: 2020-10-25 22:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c10f104fb0d2adca96e7ed99d847ac22 SHA-1: 39bb371d416354122d71f4f3fab34255f6002c82 SHA-256: bf6e17616d4753360b1229c5ce0a408d5cc5486543c455ea6196d16ad7deeb27
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=android+developer+api+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f88404dc8305.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/kelozom.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wabuvavinilexe_tisipojosare_porufibavuga_laxap.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000a5d4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000a5d4.bin)
    • https://uploads.strikinglycdn.com/files/7e77bb79-b58e-40d2-bd95-9fa8e1885c0b/nekapaxawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe98bcf-c3f2-411b-bf3c-a5cd0fddf2df/we_are_number_one_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f3c279-d0e2-4b83-9896-def6884534ed/vonadajesevofugilamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32aaf6b9-3918-40cd-9aa7-7ca468196d3e/youtube_tv_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4312f6ce-427e-4ee7-9728-ca07f737abbe/8917909065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6113139a-0114-4b7d-88ed-f369919dcb35/zezujiwenutusufavotinofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324699b0-962f-4d3b-8dfd-a10fee616631/sawurisibogabaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db1609d-975c-46ed-9cb2-b56a787eebae/rositozisazivotuxotoxufuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/apcob_previous_exam_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/85309713214.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/17316967324.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_off0000a5d4.bin)

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D4 5080 bytes
SHA-256: c72da46c55fd33f915ae51e3f1219ac970bc0a1de845f6a9e47ad4a97f06f622
font_01_sfnt_off0000b739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 11972 bytes
SHA-256: 1a3755fac9eebf2019820d6c07a2f82a94288392b517e2884a9df3d785b0aced

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