Malicious PDF — malware analysis report

Static analysis result for SHA-256 203a2df1808c9857…

MALICIOUS

PDF

42.5 KB Created: 2020-11-02 21:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b5b8c6090c3489913f0fd54b3dd7147e SHA-1: eaf10dfe232c6e87b1b1c67615153e549be3cc61 SHA-256: 203a2df1808c98578ce8d3de54337a81df1564783ca478cd1c4eba02dc385cd1
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=abduction+of+thumb+occurs+in+what+plane In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874b5e7b6ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f935264a636e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5f99403a2cc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f9fa2ab0878d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8efdc2b54c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8435/6019/files/short_term_memory_and_working_memory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cf61ed-d72e-41fd-9154-05c5e978348c/7162848371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8425/7724/files/9232207326.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/degirigidamakibir.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/searching_google_docs_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9350/1106/files/biology_12_excretion_study_guide_answers.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_off000066ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FF 5616 bytes
SHA-256: 2b4461446ed6410040601147aeed24e7c980c438f0140474b50d90a85412600c
font_01_sfnt_off000079fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FC 10236 bytes
SHA-256: 7b64a4d019bc2a2b5fecd9c5b3b7a3ac9113e0e028bfd0e168b509281b5cb2f4