Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc19f874cd94206…

MALICIOUS

PDF

43.2 KB Created: 2020-10-29 16:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 3a6a2104ee55a2460d01cc63e0b699d8 SHA-1: 7b0baf34af36ca89a74478f938c3c04ad4b94f23 SHA-256: acc19f874cd94206d99aa7ca2232674de8139e8619d01630c07504d1fd601e80
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.link/pify?keyword=christine+ha+cookbook+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5f96610102f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8a9f900e7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f89a6d9129da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5f91679270fec.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/sopaxoduwojorojobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8806a532f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f8e1abc64848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8b478e1eaa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f961333b30e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off0000697a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off0000697a.bin)
    • https://s3.amazonaws.com/wujapu/layers_of_the_abdominal_wall_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/rufasazi.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/14473537377.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_01_sfnt_off0000697a.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED3 2968 bytes
SHA-256: 282f83d0d60058b38b336e634da764e773fa7d01c86c0f43c0161739672667ca
font_01_sfnt_off0000697a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x697A 5444 bytes
SHA-256: e4db7b0f3fa20b3841d748225dd333224c2d1d38b86fd35145ac7c8ebc7e5aa2
font_02_sfnt_off00007bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFF 10340 bytes
SHA-256: d6640757b52a2ff6c1d38a33c00e4510fd737d72d9658594abedc84400d413cb