Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2f5e55ead2cf4…

MALICIOUS

PDF

47.8 KB Created: 2020-10-28 15:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3cc5d4f646bd362447751d1338605b08 SHA-1: 02a90e18f6be46fcf9fbba000bd70f6704065bfd SHA-256: c4d2f5e55ead2cf4d0d3fa1e8bdaa4a3c2bfa38bdc8f095e4157fabb52ec8f29
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a search result. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external links, many pointing to benign content farms, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://gettraff.ru/strik?keyword=what+is+a+queen+cell+bees In 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/f37c4f25-68bb-4926-957d-cfa611cd6cb8/17589039015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3944/6969/files/app_to_convert_to_kindle_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/how_do_you_say_youre_welcome_in_japanese_yahoo_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4415/0689/files/1977670601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/paleo_diet_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf03617b-2481-429c-aa39-7e0a80875576/sejafinomix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/free_geometry_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eef20b8-6b15-43cf-b732-9522c1646150/cuales_son_los_campos_formativos_para_preescolar.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/tabetenidul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/ejercicios_de_punto_de_equilibrio_financiero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed0e961-51db-492d-a0d2-2bef7aeb0356/reading_guide_for_touching_spirit_bear_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9c6ce6-e638-4ede-87a6-11eaf535486b/sulegidotovinawufa.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/wamovijakixazedeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5763/8307/files/free_intelligence_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/manual_pneumatic_directional_control_valves.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/atex_directive_1999_92_ec.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/neoplasia_endocrina_multiple_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4214/6984/files/android_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe787f7-b717-48ca-95ed-9b8939cee153/gutodizawinunozujefezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0ff350-575a-45a3-a09a-dbb642bd7bd2/doketojodomajobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/how_to_put_dnd_on_your_resume_tumblr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1124/3672/files/hplc_calibration_procedure.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_off00007d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D28 5068 bytes
SHA-256: dc7001a8deaa3610e7f1a6b24c7986fffc32ad078db425c505fff8d918f97f8c
font_01_sfnt_off00008e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E78 10320 bytes
SHA-256: 46f8b15c83e354278e8e12abe67f92f0a8beb3c9dac7b4ecd29338b12ce557ef

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