Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f45dcdf8b22d3de…

MALICIOUS

PDF

44.1 KB Created: 2020-10-27 00:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 299f74daaf56e2580075250dedec28be SHA-1: 78f7f0e0a795fc1cbe86960090ba4850e8e321e1 SHA-256: 8f45dcdf8b22d3dee3d3e6deed3cb7d69193c5dfb65c633164bbebef5a43edcb
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://cctraff.ru/strik?keyword=french+prepositions+worksheet+pdf', points to known malicious redirector infrastructure. The document also exhibits characteristics of a link farm, with many external PDF links, suggesting an attempt to drive traffic to potentially harmful sites.

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/strik?keyword=french+prepositions+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8741b42b4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5f94f5965a322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5f8b5a4d8ee93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5f96027d5bd53.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/ab19358ac5744.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/5028047.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/6020199.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/kuzazonerifamim-siromoruwefop-nemojiweti-fomirozadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5f9749fc3feb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f956ac782443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5f951c1003a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8925cae437e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5f974dea436df.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/1/0480/1042/8575/files/sajapedigawiluwenotatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8351/9918/files/79668466410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8494/8666/files/pro_asp.net_mvc_5_platform_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/solar_energy_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8413c50a-abd2-4069-89c2-86b4ef32f7cb/handyman_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f0e606-7c93-4c1a-bed3-afa26ee25c66/97507551504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19d0a34-076e-4020-9e04-47313025e067/9394611943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9626ee-8b68-4773-a70b-9bd917e09085/mebomugujusumizilugam.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_off00006bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF6 5112 bytes
SHA-256: bcf69e2e7eac844b2dc2897104906f09513cb1abcb94cf27386e71e85f5ff290
font_01_sfnt_off00007d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 11152 bytes
SHA-256: e3fe18aea32668bb6ae12974bee39b355b9292cf855cbe654dd07588e7212d04

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