Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f38ed5f8e3182…

MALICIOUS

PDF

35.5 KB Created: 2020-10-16 06:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ec63d801afbb6a736ad4679ad45dc54c SHA-1: e2e8725311bd16c09a486716a91c2bf453bd0eb0 SHA-256: bf8f38ed5f8e3182e0ef99be9f5d59e4fec37e1500c296f3eccb10deee6d91e6
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/123?keyword=manual+rotary+hoe+bunnings In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f888e84f3210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f874030ef316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f88cd68c3181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f88f12b94166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f8778137461c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f88be4fe6ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f88b9f78bb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f88f9cbe0603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f88ff0361974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f88f29a9592b.pdfIn PDF document text
    • https://site-1039360.mozfiles.com/files/1039360/27941190189.pdfIn PDF document text
    • https://site-1038897.mozfiles.com/files/1038897/semetipe.pdfIn PDF document text
    • https://site-1043195.mozfiles.com/files/1043195/antimicrobial_stewardship_guidelines_2020.pdfIn PDF document text
    • https://site-1043154.mozfiles.com/files/1043154/regibuzigol.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/ba043489-e0ee-4063-9377-5610099d3c6c/51946409899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e020c288-ec96-40da-9cf5-a64113dae966/102081275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c8d4b8-1047-4a42-aace-0d560ab69130/48938668915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8e81d6-f9e7-44ba-9921-699bbb96a3ee/29053375723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0a6c56-3b82-40dd-a11e-577d18603d91/zipome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9375/7603/files/96090719018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/parts_of_speech_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0952/2845/files/safety_valve_federal_sentencing_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3496/8742/files/xugetomaxugixodabidisew.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_off00004fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC7 5196 bytes
SHA-256: 0647fc654ff15331abb50e8d3036e6a26927c8323b6416478ecfca74b4ecc5bf
font_01_sfnt_off00006170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 9020 bytes
SHA-256: ba40002e2ad664b8f53804dc0f1e90bdce4924696fc8386489d494899ba3b69a

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