Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731a0782be97235…

MALICIOUS

PDF

66.9 KB Created: 2020-10-09 22:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0065de74750f6d337baf93ebf8a56a37 SHA-1: 5a74808e10709ebe62a45ce1d63e84c219096100 SHA-256: 5731a0782be972353a0e966d9036cb9b411da276d61860f3f6b02a02f09e5905
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=100+answer+bubble+sheet In PDF document text
    • http://files.fortmyerthriftshop.org/uploads/1/3/0/7/130740443/152154.pdfIn PDF document text
    • http://kazige.kevinmcalister.org/uploads/1/3/1/1/131164239/fewogidivuxoker.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/wiwutu.pdfIn PDF document text
    • https://site-1037101.mozfiles.com/files/1037101/xukoxedigexefulagoxe.pdfIn PDF document text
    • http://besopug.keepintouchjournals.com/uploads/1/3/0/8/130814761/bewuwemajaranet_dopajenuwanavaw.pdfIn PDF document text
    • http://files.portclintonattorney.com/uploads/1/3/0/7/130776158/dcddfa5.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/1/0497/5135/9642/files/cedar_closet_organizer_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/amazon_prime_video_apk_android_7.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8300/1756/files/persona_4_jester.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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 5104 bytes
SHA-256: bfde454027501e6790a9736074ca10c9a460759b2ba864496701c3d139a00245
font_01_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 10548 bytes
SHA-256: 386e54b47662a055d5f8e5924011827784efb960d97b412a1c401ba65b4ff875