Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0ac6b8b4b946a2…

MALICIOUS

PDF

40.8 KB Created: 2020-10-04 15:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 56a6ddeba8d6cfd3b1b3a4bd708faea1 SHA-1: 48dba7671c3677b1bf454bd1c81914baefe1af97 SHA-256: ca0ac6b8b4b946a2b77635ebe88036d18ec898f43cecc69d0948f970cbc883f0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=libro+ejercicios+ortograficos+agustin+mateos+mu%2525C3%2525B1oz+pdf+respuestas In PDF document text
    • https://site-1039356.mozfiles.com/files/1039356/42830895430.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/45967580040.pdfIn PDF document text
    • https://site-1040101.mozfiles.com/files/1040101/21713019222.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/1/0479/4826/7687/files/mapiwiteb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/st_louis_slums.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6292/6229/files/lekujodanijafivigogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7867/6380/files/self-employed_income_statement-form_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/modernist_cuisine_at_home_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31cc48e-c41a-43b1-a9ec-af9376c8156a/19414178226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54684a2-f786-4672-b543-2617502c1519/piwunaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b07ead2-d9da-481c-976e-987336a731dd/mavamijute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41aca95-1e05-4f80-be41-c3b80cc7a025/82013034764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201197a5-b0dd-43f7-9711-fffe964fa791/kitedoniworabaton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3d5fc7-42a9-4260-be02-d1ae1624fd2e/42915620712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a238007-1ce5-4550-a59d-07d0da9babbe/8791669144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee6cb87-7929-4183-b5b8-1ffedbb51282/sunisemurujute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44028d78-ed1b-41c9-92ea-80719595d912/75795473960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149d30da-a570-4881-bf86-02a00c5d0a3e/goxove.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_off000059a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59A4 5860 bytes
SHA-256: 98e66d6adc8d5724020654298c4ba0b869e1d59894969d5005e2fe7a491b4cca
font_01_sfnt_off00006d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 11372 bytes
SHA-256: bd030b88d1e054f07cb7ee80ce34e08bfc4f5fba949d8838e8878074a36edb71

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