Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6caba329570d40…

MALICIOUS

PDF

43.5 KB Created: 2020-11-04 18:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 783bb43b57371f0eaeecad8e30235a10 SHA-1: e9a7d61aeea60407f03c03c5a5ca84b057499492 SHA-256: fc6caba329570d403a18c91e32f56ca0eaea4cd7b581b6117f5f0a203040fb83
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://ttraff.cc/123?keyword=keystone+biology+review+packet+answers In PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/javakagepomo.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/wasubekafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5f93a1f4cd815.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/jamokaroxoj/betumoxodubumeki.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/fasutupod.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/dudivenelinadapax.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/62044589319.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/mitsushiba_golf_irons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8c5e5d-d1ef-44fb-b42b-8e4d9799f240/native_american_painting_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/43857668338.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/chhattisgarh_river_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7b27d7-8e89-480d-b28c-2cf3a2944d4d/kurupovov.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/tivujabuvogejosozakexive.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_off000066fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 5528 bytes
SHA-256: af885afa34e1f73183b55a7a8f222ba4a4f52034d736f2786c4fda24a7296c3b
font_01_sfnt_off000079f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F9 11636 bytes
SHA-256: 9e3741b09b3221e2b3ca0ea9590c928d0d778b04d5fc381e767508fe39828786