Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff134743f825202…

MALICIOUS

PDF

54.1 KB Created: 2020-11-03 13:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 9f24dff5f8e1c264b6fbe4baae5f79e8 SHA-1: f8f9789f64e917ab924f4fe342c7f372d440177d SHA-256: cff134743f825202ec95dc89358040127d076154c3313b4cb4c477043a62db0d
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://ttraff.me/123?keyword=achieve3000+answers+to+articles+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f8fbeb38205a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f8a3f06c8926.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/2e076f8d412a69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87033db2325.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/2c167b38-0141-4a96-aea6-39b693ed4713/gabosoxosidugizerufosim.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/thing_1_shirts_for_family.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/attribution_in_social_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9df744-d487-4b7c-9ed4-404a389a8cb8/58401540064.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/resabibajijofaxeridajam.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/10853216875.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/spec_ops_the_line_trophy_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd071d9-30c6-4850-af2b-1c66993c1749/64203261602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39d3eca-d9c3-4fd2-af24-23062cb263ef/49160474935.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_off00009408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9408 5672 bytes
SHA-256: 79e028abc1fa4d4751afc0d81f8f1c80d1fc469f912e2c8dc0a8326dea015f6a
font_01_sfnt_off0000a766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA766 10628 bytes
SHA-256: fcdacc55b64399666633440eb8e9d7da16a5899441e6c106b6dc10101bb5a542