Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49a7cd88263023a…

MALICIOUS

PDF

39.9 KB Created: 2020-10-31 01:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: fb6811574920af4b3428705d2911fb09 SHA-1: 5d1f5af4662f341baef8e4e4a94814e9243fe4bf SHA-256: b49a7cd88263023ace989f4c15fa5f5b8a649e68345e3aab409f8553ca410191
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=gattaca+movie+assignment+discussion+questions+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5f90a7cd7b89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f9548b644799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_5f93c0e680222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f8dad4eac36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5f953d0f2b636.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/laxegude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f93b13ed79d7.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/mijedusovineti/hebrew_alphabet_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1464/1605/files/84757586205.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/exploratory_data_analysis_john_tukey_download.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/pokemon_liquid_crystal_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087836ba-b822-4b76-b6b0-b8ceb88a7248/minadimibuluxel.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/lojirevotipujono.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/honey_eye_color_photo.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_off00005a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A20 5536 bytes
SHA-256: d0af3013c6d7b51f55f13fdd53ecb42caa05b4bd19e7a98dc061f99bef3cbf3e
font_01_sfnt_off00006ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 11316 bytes
SHA-256: c64a7e9b3a341e16c2025851de3862696dab4b1086ae622b63d7c5412a3b1d75