Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ed5604a8a0f997…

MALICIOUS

PDF

40.4 KB Created: 2020-10-31 00:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: d456bb3519885b9c520ca1219631a215 SHA-1: f8a52bee70f760e59f5fc944b2330732116eadd7 SHA-256: 27ed5604a8a0f99791e645d6821f67afaca8e9ab70ff74b4b004a2102ea329f2
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.me/123?keyword=energy+flow+in+ecosystems+enrich+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_5f95ab2b02e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5f99c66d8e48b.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/reriwod-zopinetedi-xuxinudizomenip-vowene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_5f996bb29b6a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f8ac02c41f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8efee83f249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f8e585a5ad6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a326d85898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f95d1ec53f3f.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/solezujisejujovap.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/cb5f087fb427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/439478d1-6aaf-44ee-a786-df6d4c959894/xedegokajunakanuwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/57185480997.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_off00005f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 5512 bytes
SHA-256: 0bcdaa42a36c14420e4bbe75491ed130dfc7c1506ad88f5f94b4327aa46a9f50
font_01_sfnt_off00007248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 10200 bytes
SHA-256: 1d523f3315746ff9d832641ab3bf9c01d83c1e9e6a58f9ca1678572a047243f3