Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdde5535c323d10…

MALICIOUS

PDF

56.6 KB Created: 2020-10-29 17:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d2474403112b6264ea6dca305df28bbb SHA-1: 1baa8d136c981bb686abbc0d97146f0a4f8d7c3b SHA-256: 3bdde5535c323d10f5c5cc58bc24e022234be097e7d99a6c4b9e493bd152991c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, identified as a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body itself is heavily obfuscated and contains what appears to be junk data, further indicating malicious intent rather than legitimate 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://ttraff.link/123?keyword=convert+unit+rates+worksheet+answers In PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/tovomowexoga.pdfIn PDF document text
    • https://leputixoted.weebly.com/uploads/1/3/2/6/132683438/ea7ac269c.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/filozavovuwefi.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/jefakokararemoxukizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f97c7b49f384.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/1/0507/1857/2704/files/gumutewujezejagenuwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4185/5941/files/vugof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/pebenabezek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9010/8326/files/ffxiv_dafangshi_location.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8669/9415/files/pathfinder_mystery_cultist_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E10 16476 bytes
SHA-256: ff4e26bb33adbbe3a0d5fd1f7d5d6fc9433933892d3fd428a3fd13ed6a00ee47
font_01_sfnt_off00009f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F63 4864 bytes
SHA-256: f23a23cc0047892525918219b993146de5c1ad9b1bb6ce4e2bff2ee38a653edd
font_02_sfnt_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 10968 bytes
SHA-256: 077aa306a2390b5a15e0ab1782606004e1da052958de0f76518bed27217cbca0

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