Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c21cf08850bb17…

MALICIOUS

PDF

32.6 KB Created: 2020-08-28 23:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7c57fb454236a7b87e052807b63f73 SHA-1: e3e4b847b9580fa0159936df98226985a77617e5 SHA-256: d7c21cf08850bb176cd8b606e0a95d0338ebd603095a6466cb9d39e18b62f7bb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to distribute or redirect to other malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the extensive link farm and malicious redirector are strong indicators of a malicious distribution or SEO poisoning campaign.

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.com/wix?keyword=2015+2016+nyc+school+calendar
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/fowevasagowalizunologulex.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2156/files/bemajefojixow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/tevavoletolisa.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd5f229bb2d4ace8ce9d91a1189196a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fa6dc405ed3443ebdf37def48f500db.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/bibebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/95557891485.pdf
    • https://static.usrfiles.com/ugd/b8c837_fff7a2b6cdc04b4a86919b16fa7089a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca669c5e18164dc7b1772e1030984331.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_off00004233.bin
207324da87c26679148a62f700c32a02587a424265a7a39f1af89521c78b39bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4233 5640 bytes
font_01_sfnt_off00005553.bin
85da0344f85d8c735153f870325fb35ade101a2a1c09d36506222f60fe8688e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5553 9580 bytes

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