Malicious PDF — malware analysis report

Static analysis result for SHA-256 67520ceb1440aeeb…

MALICIOUS

PDF

47.7 KB Created: 2020-10-11 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5f84d2cee2564e11850167a3ef42135d SHA-1: ede439dc6bd6882ce32f13be91c66fc5c6170e6f SHA-256: 67520ceb1440aeeb65cdc46ee6a4865166fe1a83c0fac9d61fef0c61b70e195b
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting it is an answer sheet for a Raven's test, likely a lure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL points to an attempt to lead the user to a harmful site.

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=hoja+de+respuestas+del+test+de+raven+escala+general In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20cd035-97e3-4097-9447-8b730b91a0b3/fojenulukofifab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c3ed80-0f63-4155-9b36-ae476ac49999/rafebuxerurewonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c39dcb8-12d0-4542-9e39-adac8a1777cd/mafutami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f464ae-2303-47ae-a3da-100123b13a8e/wipuvomufivogoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f784f8f2-940e-4a4f-8a45-44ea5e14689a/11452260753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/cafeteria_nipponica_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/jeff_dunham_and_his_wife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/funiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0689/6539/files/lifagelasemikalod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/starbucks_barista_espresso_machine_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/afpec_manual_sugarcane_juicer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e042865-0529-4b0c-acc5-c25be00478e6/zagoxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61399f4c-3b2e-4c12-9c39-1c9211fe72e1/modimoxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0785b9d-8381-44a8-8376-e0c9f7ceb375/99344290980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a402b6e-0dfc-44c1-8c38-539f36a0b37c/vizesazefiribo.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_off00006f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 5340 bytes
SHA-256: 79a7027017b163aaff73a5dac5a92ffa0597ad2125c0678af308c19c567569c7
font_01_sfnt_off000081af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81AF 14776 bytes
SHA-256: b3c2dcccc61494179892c8082ae6bd0464ac095197596d955969260c73f1537c

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