Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c6b8e483be632c…

MALICIOUS

PDF

70.2 KB Created: 2020-10-30 07:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c2e4e3e99e69c22d72443afa723bb1b SHA-1: 1f7bdfe0e4cafce1c7c5a15c92c9a8242f753d63 SHA-256: f2c6b8e483be632ce449074232d5de49c7c815a8c8d258674ba0c6a003c78f42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, contains a URL that is also present in the heuristics, suggesting an attempt to direct users to malicious infrastructure. The ML classifier strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=fight+club+summary+short In PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/komir.pdfIn PDF document text
    • https://gutomaxitokivi.weebly.com/uploads/1/3/1/3/131383747/84b4a.pdfIn PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/tuvumemote.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/zejexibavefoz-xubuf-demadozada-niruvun.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/tuzulosujekaxegavez.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/1/0434/0957/1989/files/70187834229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1a10f5-f3b7-4820-a377-abed3818b50b/dd_5e_way_of_the_four_elements_monk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/6362/0798/files/mamaroo_2018_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cce3b5-9198-4481-83e5-92601c846216/zivexodixabapuvadetezoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2406/3392/files/teeth_splinting_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6102/4185/files/ethnographic_observation_essay_example.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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 5412 bytes
SHA-256: 3736275fad13cdd516bc6cd41f3d4600a6ff69965c94240f9f09eb75042c7a56
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 13020 bytes
SHA-256: e950aed5541d564e69911afc0be0b8a80b79ced3387c55bab1aaf8b44e35dde6

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