Malicious PDF — malware analysis report

Static analysis result for SHA-256 6887408d34134ad7…

MALICIOUS

PDF

67.1 KB Created: 2020-11-05 17:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1012c4751a23ce5e1e4daf2ef64783bf SHA-1: 8f101e2d80e54daaafab5b91dd05b2ad5e001d9d SHA-256: 6887408d34134ad7256a67493a74f8acb3c981ac8cd8f3d94268f6af0914cd46
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link to 'traffine.ru'. The document body, though heavily obfuscated, contains the URL 'https://traffine.ru/123?keyword=divorce+mediation+worksheet', suggesting a lure to a malicious site. The presence of numerous embedded links and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://traffine.ru/123?keyword=divorce+mediation+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5f9881e1998e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fa39c62accca.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/kupafof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f946756b993a.pdfIn PDF document text
    • https://wigemixez.weebly.com/uploads/1/3/4/2/134265991/saluwapuw_fezofojozugafog_fozev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f89d6f795c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f88312299c1e.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/baputedev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f9c67254fc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f8ca3b0d3ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8bddd6829be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f89107432b62.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/9905364.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xozeb/systematic_literature_review_filetype.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 5364 bytes
SHA-256: 907f33b4aacf3a0c262ccaf3eb2de22b4ac9d8b5a18680a2796351aecae7846c
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10912 bytes
SHA-256: 67ae2806aae8953ee4c13a814a2817aa0725c3d7f6b5add51dd4ce84907f9fba

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