Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffc85c651fe8901…

MALICIOUS

PDF

38.0 KB Created: 2020-10-04 04:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4cee5baf8ba74b31595e9b663026a3ea SHA-1: 762ece8a726c206bfafe381b76cfc558f3733ced SHA-256: 1ffc85c651fe8901fe2c557f367983bd8482a9457068706257c545a8a105d324
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=manual+para+acordeon+de+botones+pdf In PDF document text
    • http://damorobo.veilofpsychictarots.com/uploads/1/3/1/4/131437689/3255686.pdfIn PDF document text
    • http://files.drcawkwellmedicine.com/uploads/1/3/2/6/132695416/3357943.pdfIn PDF document text
    • http://wefujesol.jpsousanhsband.com/uploads/1/3/1/4/131406086/muvavonenimosofut.pdfIn PDF document text
    • http://files.pvgindy.com/uploads/1/3/2/6/132695306/037b845086d0.pdfIn PDF document text
    • https://site-1044309.mozfiles.com/files/1044309/tutimemureke.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/5054008880.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/b2fce502-7011-4f36-8fdd-98a15d56e452/37026389031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb7ee81-5c60-44d9-8b7e-3117959c22cd/dorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08ac53e-eab0-4c7c-8f93-fd2ca40b0a59/nedujefulubujogaperiworu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8731/8180/files/gopapaxuboxoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/damasebomidizeboz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3241/4872/files/94931300463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1207/4915/files/13771641961.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_off00005182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5182 5292 bytes
SHA-256: a87c3aa161803317a1862585baf555d538d25ae75dd2150a8c26d2614b0f0f43
font_01_sfnt_off00006392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 11700 bytes
SHA-256: 7d4e03831b3bc86b79c6d5b5e862bbcabbee8a67c9425f4af1f59842ce5f130a

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