Malicious PDF — malware analysis report

Static analysis result for SHA-256 33849d266b9ad6cf…

MALICIOUS

PDF

40.8 KB Created: 2020-10-06 23:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6f5d834c3b162c4aea91934fa706defa SHA-1: 667a1004ca5b12745b3ffcb01040e5ab1c255ba6 SHA-256: 33849d266b9ad6cfa1638e5b5077505615cf7eb6973dd91d1b5035eb38961c73
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=age+of+wushu+vagrant+guide In PDF document text
    • http://zogub.alisonlmiller.com/uploads/1/3/0/7/130740597/bebuken-zepiruruni-moriraxuzi-zejeviko.pdfIn PDF document text
    • http://zipewovi.biobotimy.com/uploads/1/3/2/6/132682404/nipegalujenesu.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/e7af3324-1a1e-49b0-a578-919d1aab2e0e/xavadizasetazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a586e022-75de-4caa-ba3a-a0b7194716a6/vodowirovidaxokatug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0bd006-a4af-4fa2-8ae7-8206c3b59bc4/verasenedudotijelezijun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea463de-798e-4c02-b9b5-21f347f10bb1/jusanipolorexas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b30d35e-03be-41a5-b949-0213fd550e14/92194914869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e4a21c-cbe2-47b6-9672-85f760bd4a5b/kujavimopuzijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b943e5b8-a9f7-405c-b16b-3702c7706e7f/39846123411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2608d0f-9dcf-44a2-bf12-0004e046dee2/nisigiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45592fe-1939-4474-926d-d178343a0e83/54709092456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f0ab26-64e6-4634-9d15-d25548289881/42999039096.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_off000061eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EB 5276 bytes
SHA-256: fafd88c30285a53456b5501fab3142b6c86d0dfff66b846386a651c80205f1c9
font_01_sfnt_off000073f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F9 10208 bytes
SHA-256: 8b2f21a0da4766ab7117277b8fe209289383f7210e447fda8241c2f49ded2101

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