Malicious PDF — malware analysis report

Static analysis result for SHA-256 4179edf251d1186f…

MALICIOUS

PDF

58.4 KB Created: 2020-10-02 03:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 838c7638053a63d6f5c9be86ad63e8cc SHA-1: b352637124f82f6172cbfd50aea9d165297153ac SHA-256: 4179edf251d1186f72b25a1f02ac880e05696abc6d51daaeb85842e00ce1e015
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://ggtraff.ru/strik?keyword=codex+heretic+astartes+2+pdf In PDF document text
    • http://files.pawsuppetservices.co.uk/uploads/1/3/1/3/131383746/lukezepexoxukewamibo.pdfIn PDF document text
    • https://site-1038675.mozfiles.com/files/1038675/20889287195.pdfIn PDF document text
    • https://site-1038337.mozfiles.com/files/1038337/11889764867.pdfIn PDF document text
    • https://site-1039658.mozfiles.com/files/1039658/riwodi.pdfIn PDF document text
    • https://site-1037267.mozfiles.com/files/1037267/sugog.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/kegebumowidutuwenitixoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf8f89d-4373-4a06-abe6-06a47519203e/dosokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b91fabc-b6bd-4d3e-acf1-e7ef8f480ae3/fatimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5725ab-77ec-4a7e-9672-4db534373441/97418897566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5175d2be-acf1-4fce-a1e6-9a026f51f1d4/83093142982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc1083e-d292-43e0-8515-c8ffc14c5b45/nemelodisonomiti.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_off0000990b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990B 5316 bytes
SHA-256: 8cacba305446f787d9a230eb3b7a9c2367ca6d03441fb974399bf37522da33ab
font_01_sfnt_off0000ab18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB18 16240 bytes
SHA-256: faf41e963844cd3429e6b0100fce69374ce637a52bfb03510963faf82ea497aa