Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8bb0b9effc00d8…

MALICIOUS

PDF

39.8 KB Created: 2020-10-25 17:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 635fed42f3e918e35fb55de07935d7e5 SHA-1: 5df9f7c48416112e4c2022a05520e12c5a92c76e SHA-256: fb8bb0b9effc00d88764fe6931288ab53db7fdd79bab654c2ca03453d49cd086
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/pify?keyword=guru+mann+fitness+paid+apk+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5f933aec5d100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f953c2d9c553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5f91daa38346e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8756a11f6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f8e2589265da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f90b4c7766fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f893019699f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5f939e1b60317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f93a103012c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8d613764a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f8f625f4b2ea.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/bd0d7.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/3223528.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005c6f.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005c6f.bin)
    • https://s3.amazonaws.com/henghuili-files/kekosovevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbf22f5-9fac-4e5d-8b41-4a62c86b1b83/9532349135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a206ea-4499-49ae-a93b-7376bc801c16/dulufaxodezenuzega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7a4f0d-5713-43aa-be39-d75adba287cf/satibofapirinirutunal.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_off00005c6f.bin)

Related samples 6

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_off00005c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6F 5376 bytes
SHA-256: 90bc97c91403fde9a8d9270a7e209d3876b1549d64248e39baf09ab1b52ac0ba
font_01_sfnt_off00006ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBC 10388 bytes
SHA-256: cd76293dd483fde485e4f05e9275d1e011eb8ce14461a7c34621758db2ea1d08

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