Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78b40ff5ebf7339…

MALICIOUS

PDF

41.4 KB Created: 2020-11-06 22:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d7c77e2c2d45527279e2aea403b5e900 SHA-1: 37eacfd15bf5d4cd4c4b695dc7def9b3741f4ce3 SHA-256: d78b40ff5ebf733915d43a0d96f2f24d1e537e8741f56bb00d1b8035a4f91f25
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://traffmen.ru/aws?keyword=geometry+dash+full+version+apk+mega+mod In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f8e23d0901c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_5f9d8b5ba42f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5f9fd7da498b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f8aa5087b4e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8729ed7a60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5fa553acb1045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8756cd43fe9.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/cebb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8ed899c5469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5f9264d24e204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f8bcd593537b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_5fa049904e39c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5fa1f5874a203.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/doteta.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/wajufifenoxuj/citation_machine_apa_6.pdfIn PDF document text
    • https://wefaresif.files.wordpress.com/2020/11/nipibewotaxatipu.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_off00005f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F05 5712 bytes
SHA-256: 68a718d9666291b4dbfe2ec52407caf06af1d45ea82d89ef8c247211fb8b814f
font_01_sfnt_off0000725d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x725D 11220 bytes
SHA-256: 0753e48629ceea77bdc8cd1ef63e6d7ed9281bea13820dca6e362c0ddd0f5513