Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d468d2a4113fc4…

MALICIOUS

PDF

44.9 KB Created: 2020-10-16 23:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e6f31d3319cfd7fbc252f6dd2d26a32 SHA-1: 3ea5cc1b439f3d27d9aa1c63b40ccda34f537ae1 SHA-256: 46d468d2a4113fc48d1d48d268897e658857500e9666b272cf4a4c47e960930a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, contains the redirector URL and references to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the heuristics confirm the presence of malicious redirector links and a link farm.

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/strik?keyword=mom+breastfeeding+porn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f89c10b53835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f89430fe3571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f887b32dfe6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f895f1d91d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f894e6b14ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f88afccec2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8706a2d7952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f88aa1d04587.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/4a81c62c-859e-421b-ae2e-d7db65d4cd38/gademitil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634a4409-8b51-4a1b-9f9e-058cf2efda02/febetat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd721048-2027-4c8f-a2b0-67fcb455f81d/bijowububafopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad539cb2-d28f-4a8a-8507-7dea8d723963/worat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54af4582-d443-432b-b37a-96de1dd6ae00/71667097483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0887/5422/files/elements_of_movies_what_makes_a_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7198/7098/files/67451059169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/pitusobiwipobojemofod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/90733714696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a508a53e-9f26-42aa-940f-8b6427451c9c/94849421936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a52416b-f941-41ae-b919-418f6b801595/rajokipiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfb520f-5f0f-4158-9763-14262c550a7a/89000205127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e12bbef-7708-4769-9566-93f939e1e133/57839607165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ad9fc5-8d8e-4fa9-a388-a08ddeb0976e/jowaxaxepawabigi.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_off000065e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5472 bytes
SHA-256: 11bff92676b968a164257c375ef95210a5a2929e63d5d61e2adbb87d90db8bc6
font_01_sfnt_off0000786b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 14088 bytes
SHA-256: 27a756232233869e3aab36af13776b32875afea7e6971fbf5f490342ff04358f