Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11a33c1d6d7e952…

MALICIOUS

PDF

43.6 KB Created: 2020-10-28 12:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: daf96cd66090cf2614af588f3f864227 SHA-1: 246edb802acba800d131007b60ca32ed4c744cd5 SHA-256: f11a33c1d6d7e9525448b2a8cb3d55df0698e7201cd683ab9a1ed16c15063241
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a link farm pointing to known malicious redirector infrastructure. The embedded URL 'https://cctraff.ru/strik?keyword=dnd+5e+ship+names' is flagged as malicious. The ML classifier also strongly indicated maliciousness, suggesting the document's primary purpose is 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://cctraff.ru/strik?keyword=dnd+5e+ship+names In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5f92f93908a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8f6f57079a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f903e41655fa.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/5779180.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/8690a24a63d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5f985ecb2c265.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/40d9ac0d75210.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/pixajipe-pebivigo-goxetisanin.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/6098486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/77454088161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1496/1321/files/marcovaldo_italo_calvino_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/quantitative_data_analysis_process.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/ragalul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3329/5546/files/ulala_toy_store_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/xuvekaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/79299262424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0762/5381/files/87854063413.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/28493771105.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/ps2_emulator_pro_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6010/0765/files/work_energy_calculations_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6493/1992/files/28459397021.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_off00006a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5D 5192 bytes
SHA-256: 267fd40885970927c6a2ff94c2c01f230f7459c2122d3336f5c29e00c15eee7a
font_01_sfnt_off00007bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEA 10900 bytes
SHA-256: 26f88234af0b0be9dab8ecde2d24d590fa22b1a5483693bd9939081966dee2c8

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