Malicious PDF — malware analysis report

Static analysis result for SHA-256 426fd66cd106459a…

MALICIOUS

PDF

42.9 KB Created: 2020-10-08 17:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 9f56ffc342806c3e040f1511246c1dfe SHA-1: 0f57d369dbd4f7abe5ed8428155356ccbeb3ce9c SHA-256: 426fd66cd106459a3e80c45cff51864a9db911f22d7f16819c1710db9b5d2761
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=ept+reviewer+with+answer+key+2019 In PDF document text
    • http://fogirizax.mitchadvent.com/uploads/1/3/1/6/131637046/tajujisokifa_gojedomobeke.pdfIn PDF document text
    • http://lojusal.autumncrowllc.com/uploads/1/3/0/7/130775034/nomatobuza.pdfIn PDF document text
    • http://files.kaffeestubeschaumburg.com/uploads/1/3/1/8/131856705/3313575.pdfIn PDF document text
    • https://site-1038390.mozfiles.com/files/1038390/19562107453.pdfIn PDF document text
    • https://site-1042188.mozfiles.com/files/1042188/xafavagomasakibenagidewo.pdfIn PDF document text
    • https://site-1041206.mozfiles.com/files/1041206/kupigejufesudosozaw.pdfIn PDF document text
    • https://site-1042348.mozfiles.com/files/1042348/zimufomosekogupu.pdfIn PDF document text
    • https://site-1042554.mozfiles.com/files/1042554/15482705075.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/1/0483/4639/8870/files/voices_in_the_park.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4590/7349/files/toad_life_cycle_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/lujapesawusazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3121/5259/files/providence_paintball_clearwater_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0204/6882/files/tizovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/5390/9660/files/helga_and_arnold_get_together.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/ramsey_growth_model.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_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 5632 bytes
SHA-256: 5663a88848cb546a933abde7ce9f88aaa4d15217de788da63657014b1a24ae1d
font_01_sfnt_off00007bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 10340 bytes
SHA-256: bbf0cd57977b8776f564843ad2347309110fd35cf2990663d26506dafd5d96a5

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