Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e4f780028bce3f…

MALICIOUS

PDF

34.9 KB Created: 2020-09-30 19:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 24847953446cd9e06bcfb2dc21d512da SHA-1: 716c58ad0e151f4a4b8372f2fe907626a34f4da3 SHA-256: b1e4f780028bce3fa524514b9782ad4e27c26deade39a91f8a6f1b36c49c529f
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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/strik?keyword=printable+pictionary+cards+pdf In PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/xojawato.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/38867494801.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/58873494312.pdfIn PDF document text
    • http://files.haylexgrant.com/uploads/1/3/2/6/132681619/f3daa81.pdfIn PDF document text
    • https://site-1038647.mozfiles.com/files/1038647/60377958897.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/51447936972.pdfIn PDF document text
    • http://gigamepe.asiamannwellness.com/uploads/1/3/1/4/131453175/4249398.pdfIn PDF document text
    • http://files.aqua-exercises.com/uploads/1/3/0/8/130813511/9068084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00004b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B06 5392 bytes
SHA-256: 35d48a5b11bf6a2730b6b15a0319fb646bb5b3b46dbc994ee2803e3dbf46e66d
font_01_sfnt_off00005d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 9960 bytes
SHA-256: 5a37b8d2a429efcf55d176f4a2467c765ac197cadc1dd7d945a676e145bb755f

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