Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a4e759680420cb…

MALICIOUS

PDF

43.2 KB Created: 2020-07-27 22:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2890deaf1307760e8affa2548538ff SHA-1: 720e45bf6254f2dbdc082f505158ac926e1d664e SHA-256: e4a4e759680420cb410c6ae0badd5954f1a933eaf98d051473f8082e4d8b2c55
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic identified links pointing to a known malicious redirector service (ttraff.cc), suggesting an attempt to obscure the final destination of a malicious payload. Another heuristic detected a large PDF link farm, indicating a potential SEO poisoning or spamming campaign. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

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.cc/pify?keyword=che+guevara+dj+song
    • http://files.motivationalfoundation.com/uploads/1/3/1/3/131383434/ginevaredosu_pafupunew_ripikobuvi_liwesulaf.pdf
    • http://files.aiswn.org/uploads/1/3/1/3/131383297/e151dbed.pdf
    • http://files.suepedley.com.au/uploads/1/3/1/3/131398374/nonilinivomiz.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/34558027882.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/sokiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/31920565071.pdf
    • https://cdn.shopify.com/s/files/1/0437/9262/9917/files/31253716880.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/tipoxizamulurogoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5432/files/94438219278.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/8503691255.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/77964885065.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/jolox.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/22108814066.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/bulemabifobovilizoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/renilozoxobevo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/59326875839.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_off00006344.bin
21ff7889022eb9c72f21361641b3ac369588c884ddbd94fe81fca21fccc8b2ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 4968 bytes
font_01_sfnt_off0000742e.bin
6980a25e090f30e12596503be561f44882f0d38a55eed5e2586a674f5e8578af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742E 13280 bytes

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