Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eee4c90bdac563…

MALICIOUS

PDF

61.2 KB Created: 2020-10-10 13:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7b8993ec4ae4ffb09858960a743a7bd5 SHA-1: aec93325dbcfc70096b95c1b8b7d5e4dced0749c SHA-256: 77eee4c90bdac56397781acb31cca311eb83bb99b688d5e19b9dc8f2d0c1e250
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/pify?keyword=the+scots+confession+pdf In PDF document text
    • http://files.studiocanvas.org/uploads/1/3/2/7/132712676/bolamurulofedug_nusokut_vexadujavati_gixarik.pdfIn PDF document text
    • http://files.chartiergrp.com/uploads/1/3/0/7/130775231/1533294.pdfIn PDF document text
    • http://xufegurif.tegnadesigntank.com/uploads/1/3/0/8/130873867/pafatewu.pdfIn PDF document text
    • http://files.stamboekbmp.com/uploads/1/3/1/6/131637313/704c7db22.pdfIn PDF document text
    • http://gomelejir.optimizedcompounds.com/uploads/1/3/1/4/131453526/zusuxowasu-pedowunitusaget-lefik.pdfIn PDF document text
    • https://site-1040297.mozfiles.com/files/1040297/galinig.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/10675929302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1889/4498/files/rexuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1386/5124/files/pozanopapidote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5316/9826/files/rojajapobug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9799/5429/files/lanewunomepuvikufax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8685/5844/files/cycling_merit_badge_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0323/1646/files/tobivevuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA74B 4644 bytes
SHA-256: 458a43b29b5a058dc19fe68a557ccdaa0c77dc7f25aa99e36234cccd6cf0a8d5
font_01_sfnt_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 10188 bytes
SHA-256: 03e6aaa0e5a1c5bbeb6476c11038ae8f499c678606e2756fa341f3cb4f7f4f46
font_02_sfnt_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333