Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9298f37f8a8d4…

MALICIOUS

PDF

47.1 KB Created: 2020-10-27 13:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2845c479e0f3b5b845f5246d03edf44c SHA-1: 1835659ce9f25a2f41d17a883252f2804bb0d826 SHA-256: ccb9298f37f8a8d4611e3f8f8eff12ff22cb1a9ca94cdad2024c5e839f1a2b36
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised with text suggesting it leads to "civil war vocab word search answers". The PDF also contains a large number of links to other PDFs, indicating a link farm. The ML classifier strongly flagged this PDF as malicious.

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=civil+war+vocab+word+search+answers In PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/sipalemugud.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/rukeviv-gelizuvemal-febabovozivuru-xiwufor.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/2604921.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/1/0434/4699/3052/files/89474165980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9457/1163/files/fagab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6277/1366/files/xiriwitusagug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/present_simple_negative_form_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1748/8549/files/applied_combinatorics_second_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/91073213856.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/zekijivopevoragulobupar.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/kenofugemipezovuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3943/9032/files/welupokogulizetujir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9893/0341/files/59260347942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8794/0776/files/car_crash_test_simulator_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/auditing_cash_and_marketable_securities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/27641443457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1135/4005/files/da_form_4179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4646/1852/files/worivixonopo.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_off00007815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7815 5224 bytes
SHA-256: 7c3745a4a3ab6e387d6f81561997ab239986d7ae898dcf459bd7d269466ab566
font_01_sfnt_off000089da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 10844 bytes
SHA-256: f7c854551fa884a58b456e7a5949996be0905f9013541ea31d5fd6f796c112bd

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