Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5e5fcf1e87aa54…

MALICIOUS

PDF

40.0 KB Created: 2020-10-29 06:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 18e56e9399a3ab10cb4d144905365f10 SHA-1: 7d7bc63a217895e9deb8f1c8651e2bd9c48557ff SHA-256: 2b5e5fcf1e87aa544e4259fd7a39f527092c7c46b961e65f01782b0f471173db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a large number of embedded external links, many of which point to redirector infrastructure. The primary malicious URL identified is a redirector designed to lead users to potentially harmful content. The document body contains garbled text but includes the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=easycbm+fluency+benchmarks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872d8672669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f8db102da4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5f94eb9087ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f8be3b030cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f86f5b613be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f88d6fff208a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f8d982286b3a.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/1/0501/7934/2526/files/70246771411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0486/2879/files/large_numbers_worksheet_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/vadiratejizotuwaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/avanti_washing_machine_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4440/7966/files/jufuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/rorovulis.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/hardest_game_in_the_world_2_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7425/1671/files/worksheet_change_in_excel_vba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1324/6623/files/photoshop_cs3_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/fofodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9343/5589/files/govinibogulexov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0270/2242/files/what_does_highlighted_comment_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/xavogor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8197/1908/files/22652389536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4563/8303/files/sujet_brevet_pondichry_2020_franais.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_off00005d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7E 5384 bytes
SHA-256: c1229d69b6079e2b27b5d40d2b8a074125727cbece20893779083dddac8f5b3b
font_01_sfnt_off00006faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAF 10448 bytes
SHA-256: 66290c501262ee0757a0a36c0e0b405876c576d0957f0b2b798a68c30566bb44

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