Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4d3421b61bfd58…

MALICIOUS

PDF

67.5 KB Created: 2020-10-28 18:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 56020cfdfbdb584f1221b90914d7a883 SHA-1: 7f61c56991f3261a61c2a8eedcd5d6dd1982e992 SHA-256: ef4d3421b61bfd58f1d32750e50593df29c144caddd2ed9db33721a8ed6e16d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, forming a link farm. The primary link, https://cctraff.ru/123?keyword=new+jersey+shore+marathon+2020, is flagged as a malicious redirector. The document's structure and content suggest it is designed to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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://cctraff.ru/123?keyword=new+jersey+shore+marathon+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_5f992c7837e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8cca2c23f3c.pdfIn PDF document text
    • https://biwireteput.weebly.com/uploads/1/3/4/1/134131636/wuzam-dorifasuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f8a1e3a8d80b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f88f915b7cc3.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/nusemuviborokoburu.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/juduk/affirming_diversity_nieto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a87054b-ac3e-4580-886a-8ac0a244ef1b/26919032923.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/dictionary_of_english_synonyms_and_antonyms_the_penguin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6677/8295/files/field_plate_armor_pathfinder.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/building_materials_civil_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/definition_of_exploratory_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/charter_ref_code_s0600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065f51db-14bc-4371-b42a-7f4618db718d/96535205420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/jegamopusonozogexu.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/scavenger_hunt_worksheet_and_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/kaxozewasoxunipoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/calorimetry_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/64684088857.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/tenafevigisagone.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_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 5408 bytes
SHA-256: 43b42ad1e1fdda7f5da02575d02dfefc221b4165597b43e21b6726403fc30fa9
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 11292 bytes
SHA-256: cbb9f47062d9404d80c89a30304e2fa46f6685d0c37f8f168d372d994c31491f

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