Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb7ccb316b706f7…

MALICIOUS

PDF

43.3 KB Created: 2020-10-16 11:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bdd425abbb607eeaf3a2c608c163db44 SHA-1: 34086681ce496c9a548d0b2a15a89d4633922296 SHA-256: cdb7ccb316b706f7191154f52fe3becb43c99b3f9ad953b3aee0224e3188a1c0
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://gettraff.ru/strik?keyword=head+first+data+analysis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f875e41bca9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f87aeecde025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f87166eed270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f87aa915a7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8738521c416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f878925bac38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8881bd79648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f86f9e5a9137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9650/5496/files/siemens_ac_motor_catalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3092/8279/files/vawelewofosimul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7391/1963/files/45783474464.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/13_may_1969_incident_malaysia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5411/8550/files/outlearning_the_wolves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/one_in_a_million_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1408/5544/files/weslo_cardio_glide_total_body_motion_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3421/3538/files/sijozaxibitezenevetajit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/6601604058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3658/5379/files/55420250035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1185/6322/files/terraria_calamity_class_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4062/2760/files/44989316443.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_off00006ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 4964 bytes
SHA-256: 8c638035c19c79a9dd97f19413d7eb072d46fe4f709d3afaa4a1998e115b061a
font_01_sfnt_off00007bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC7 10532 bytes
SHA-256: 76165873dbe270f1e2eeed2fe0e3d6f475377b82a4b4b3220d199e9f8a2c4db1

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