Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a318b19e911421…

MALICIOUS

PDF

44.1 KB Created: 2020-10-07 07:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b52ff47bb7663d6a695b18b524c46430 SHA-1: fccd0785689310f671887bad079e95af687a03d4 SHA-256: 34a318b19e91142100fa393c82e0a9d38983d9b406285464cb903132f4712b24
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=chingonario+pdf+gratis In PDF document text
    • https://site-1039398.mozfiles.com/files/1039398/5575953310.pdfIn PDF document text
    • https://site-1042498.mozfiles.com/files/1042498/56248251325.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/91289324086.pdfIn PDF document text
    • https://site-1043329.mozfiles.com/files/1043329/67285362466.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/tobesavikitigolerowo.pdfIn PDF document text
    • http://files.awaypaintherapy.com/uploads/1/3/1/8/131856851/2392258.pdfIn PDF document text
    • http://files.spolecnetozvladneme.cz/uploads/1/3/2/6/132696580/zomix.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/1/0428/7689/5388/files/modern_combat_4_apk_zip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/atp_and_photosynthesis_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8074/3080/files/sony_str-gx390_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/68835423930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdfeaad-e9ed-4cf2-9cef-329dbccf463c/geravijunozojedemuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a516d711-bedb-42e1-b973-5195e4671dc1/tejifinizeduderabe.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_off00006781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5176 bytes
SHA-256: 3ce79f75a010fafdea09660580f8e777bee0b76626b0301aed55ef1dc9fe3958
font_01_sfnt_off00007916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7916 13456 bytes
SHA-256: fe95844fd25e1f881ccbe45cc514b535b96361f35ae9f7409b993d4a8478d331