Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4381c697b8c8ac8…

MALICIOUS

PDF

42.0 KB Created: 2020-10-27 02:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 83e023dbda7baa0bd2c422e93be4101a SHA-1: 08311a74666c570c5813e728c1eaa4cc0aa8f674 SHA-256: f4381c697b8c8ac8fa04c0b33bd2654ac96dc862500c2b62c3eb6c7b635291fc
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/123?keyword=longman+academic+writing+series+4+answer+key+fifth+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f92674ac3dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f8f4b111da03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8b3f282c382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5f947161263c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f876b89e76d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f87b20fa0063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f8fa0a19faea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f8fac9d9d7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5f9201d5b612f.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/sosomesa-norotogikuz-zuvobevuvigip.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/8084845.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/bejenis-bimedut-logarogube.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/2123953.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/9c61d878584d.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/jowutoneranemuk/cape_sociology_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/32877035778.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/maths_book_for_bsc_1st_year.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/excel_formulas_with_example_2019_download_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6137/3847/files/twelve_angry_men_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9725/0711/files/werezesej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/76810073948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1229/1264/files/wbcs_prelims_question_paper_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8494/6850/files/43355340304.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_off00006430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6430 5688 bytes
SHA-256: d29021d11e552dfd757baadce765465afc5b7a258594716e7418ce750a71b101
font_01_sfnt_off00007785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7785 10128 bytes
SHA-256: 026855885974f4c92b3f357b849ef08b1a02efb5cc0f514e566536c6e1d3aca3