Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd518b5834c73dcb…

MALICIOUS

PDF

43.8 KB Created: 2020-10-26 00:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1311002f1eaa75fd2b1aa0ccfd933002 SHA-1: 42abfe37e9c56a4e0bf97465bbb73e7670ba726b SHA-256: cd518b5834c73dcbfc18b366ae1a33afc199268bdc6596597aaca9bf9850e6d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://cctraff.ru/aws?keyword=around+the+world+in+80+days+full+book+pdf', is flagged as a malicious redirector. The document body, though heavily corrupted, contains fragments of the target URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically to appear as a search result. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=around+the+world+in+80+days+full+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f89a3784d82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f94835fb894e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8af147c375d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f9174b81d0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f8e33380fe0e.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/2592394.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/85ca8d6.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/wuniku/artropodos_caracteristicas_generales.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/lovolezekerefigokarisagob.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/save_base64_string_to_file_c.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/17798664467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970e2b72-1d53-4dea-9086-e4f50e9eae91/4322382892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e47191-9ca6-4a0b-897f-513f43a366ef/81205661783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c71945-d83f-421c-8dba-41d4595075cb/gewulepesevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032e5d0c-718b-4aaf-b32e-e70084b39e26/wifenexemebovomin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b239c0-67b9-4a81-804b-48e00fb367fb/mepovebowowox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a93062-666e-445a-9103-0e50cab0f226/71904843757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde2d826-231a-4e61-a8ef-a91eb638b5ac/holt_mcdougal_biology_textbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954f5d00-d65d-42e8-997c-2a45189ce769/mazidowawuxegepudebuwuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf052ad4-f362-4d25-a0f5-e6e12fe3c8dc/74522010980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fb9507-7ef8-439f-8018-07b88f27939a/65595999691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd729424-1889-4878-ae09-2fa5f1a71675/54199333693.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_off00006a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A29 5852 bytes
SHA-256: 961f18700c695c7e1702af724045528872324c9aa577c5222877a63b9fe8d7c8
font_01_sfnt_off00007e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1B 10392 bytes
SHA-256: 228a8afe33f659f1bb372aa782759957600c5cd8efb6d628124e72274e632bde

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