Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4edcdfb08aa33e…

MALICIOUS

PDF

44.5 KB Created: 2020-10-11 23:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b04d64ab5e15782b97b0abf7fbc3b260 SHA-1: fdd15fbb8b57eaeaf9819258110c39c42c4676f7 SHA-256: ab4edcdfb08aa33ed6d7cf02ca45ac1d8176382bea450a628bc2bff17b5610ec
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://cctraff.ru/strik?keyword=stellaris+ship+sizes In PDF document text
    • http://files.braxtondolce.com/uploads/1/3/0/7/130738801/2292080.pdfIn PDF document text
    • http://files.tafffurniturestore.com/uploads/1/3/2/8/132815004/227989040e.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/1/0439/6898/7294/files/74826093053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6767/5302/files/vunasilabijopabojilaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0403/7790/files/lesson_5.1_practice_b_geometry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/princess_diana_doll_in_wedding_dress.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/fexomusanegotaribozafak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6465/1687/files/89761820493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9436/7655/files/84175045949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4353/2185/files/58089470477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/2652181766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1838/7107/files/la_fitness_flagler_street.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/vupuxifibopomubul.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_off0000719b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 5060 bytes
SHA-256: d2039768ae2d274a4edb923500d2e1e1736b944a8da0839749abf59f3d9fa345
font_01_sfnt_off000082cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 10028 bytes
SHA-256: 7f28c1450650cae3ad9137e6474275257848e971687f1a669179caf357c989f1