Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa63565dfcc32a9…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 09:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 226476b16f1abb16f97b5a5c1ad850bf SHA-1: f206c87c3443a36c0759aa1d7be262349b4d119c SHA-256: ffa63565dfcc32a9f8efd66b6b1a6443c7e8f56c164132373ef9b32923f39f10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document was flagged as malicious by a machine learning classifier and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic, indicating it points to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded links to external PDF files, likely for SEO manipulation. The document body is heavily obfuscated and contains a URL that appears to be part of this link farm. No scripts were extracted from this sample.

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.ru/wb?keyword=diabetes%20insipida%20nefrogenica%20pdf
    • http://files.op-com.co.uk/uploads/1/3/1/3/131380504/9381456.pdf
    • http://files.peterpauljones.com/uploads/1/3/2/6/132682819/e830c090.pdf
    • http://files.industrialinsulationsupply.com/uploads/1/3/0/8/130874160/fowibulamak.pdf
    • http://files.hermionemerry.com/uploads/1/3/1/8/131856034/wozoruzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/vorawijigasezul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/20278500442.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/42437659354.pdf
    • https://cdn.shopify.com/s/files/1/0437/4193/7818/files/16838568953.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/bajizebilolujul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/wepesujuminagujagawazifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/24105934233.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42228357160.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/koponog.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/60905851577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/1326356124.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/kuzopizufurorogub.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/duxirefufatujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/2006_scion_tc_repair_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008466.bin
7a7745d0018d532e8bdaf5c5e4558c5626431fce2845532b8b759422a8875419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8466 5428 bytes
font_01_sfnt_off000096ea.bin
97f626b056612702ec9a520e4218ece98cb314afac917c3b298897f4b3ed8aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EA 13264 bytes

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