Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a5c6a6c7ed053d…

MALICIOUS

PDF

49.0 KB Created: 2020-11-01 11:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 965ecd83c453dc76b86910c649a58211 SHA-1: 9f7a10c4ba41f0547c6c141422d6f9afc0bfe6c0 SHA-256: f9a5c6a6c7ed053d9cf62c2220417d15f716d5d85b4e3d917bbc0cd8d0f8595d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to look like a school calendar. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful content.

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=2019-20+school+calendar+dallas+isd In PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/59cf4021f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5f9808999021f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8fca8263ccb.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/gulavidijo.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/0b38bf60dfccbd.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/lunukamumatas-nuxob-bilivetewupedit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5f94449ec9027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8e52830860a.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/a204c0b5.pdfIn PDF document text
    • https://komavumi.weebly.com/uploads/1/3/0/7/130738531/gisifi_bikojufire_pifebozimojil.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/datumipod.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/1/0496/7494/4671/files/tetelolilejonadese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/7318/1096/files/creando_riqueza_pedro_morillas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9495/6959/files/puvuzopesirotasibinitinol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/jizikaramexosifafazo.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_off00007e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 5444 bytes
SHA-256: a96dcdbe030e85ef50b16ee0d99e6fb4a801892853f44e1f171ad2b29e038bb3
font_01_sfnt_off000090c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 11464 bytes
SHA-256: b1724a21b17054c20ecfb3ca45668a8537aad6e51661f9d5f1e7e2acdbdf6a54

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