Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f9c9e15177b480…

MALICIOUS

PDF

40.8 KB Created: 2020-10-31 00:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0f4944907b3a499eb5124da1ea405cd3 SHA-1: b11330849b4ff36c90950792732a0a387444ef8d SHA-256: d3f9c9e15177b48033d74af42cc88c32af4c93a73718ea8f3366d911ff631b27
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/aws?keyword=guerra+de+los+pasteles+resumen+breve In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f87eaea92700.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/d9e05115-e84d-4fe1-bcae-bb97f2c42a71/pujilolebujasojis.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/jamojezivuzivisozawa.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/722464993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ed0b67-093b-4424-b8ee-d1adb3896775/gekazusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d8f076-77c9-4000-b0bb-168e97ac70e2/garuwidi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/tatala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4565/2133/files/cycloplegic_refraction_prescribing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/talakubowov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0886/7491/files/87264831549.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/tigofomubuwade.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_off00005f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 5336 bytes
SHA-256: f5689e5eb02c0f923350bfbafe6dd0dd4e3a81c0d588a63311b69329be65bf58
font_01_sfnt_off0000715e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715E 10972 bytes
SHA-256: 31b2752a5a57743c6e4a704022155d1b355784be96d91930a85e249fec6f8eb2

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