Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd33253a86eddc4…

MALICIOUS

PDF

35.1 KB Created: 2020-08-19 02:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9e279d155e7377276cc02ab7b2f431 SHA-1: 4572a5df2923363ad50a549cbe0919fc9e0c61ae SHA-256: edd33253a86eddc4efbb1e77ea91323efb3c087f6e9d6cfb486b613f6b2daf23
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=ffvii+aerith%2527+s+theme+piano+sheet+music'. This indicates the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=ffvii+aerith%2527+s+theme+piano+sheet+music
    • http://zegaru.danvaningen.com/uploads/1/3/1/6/131637814/383c3be3ef8.pdf
    • http://gajix.gentlegypsies.com/uploads/1/3/2/6/132682883/dorarosinerodolel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/44318563041.pdf
    • https://cdn.shopify.com/s/files/1/0429/1864/1830/files/bicycle_race_queen.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/29539243350.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/tavijilowazegapotunas.pdf
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/definition_of_document_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/21716292318.pdf
    • https://cdn.shopify.com/s/files/1/0447/0390/7993/files/wuvubidarat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/nevosuzegokadewojobakivut.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_off00004b71.bin
b149a09dfc78d907b2e226fa502b9deb548bb23ee8ddbe9255fd6eead5efb459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B71 5272 bytes
font_01_sfnt_off00005d54.bin
2ec47f48bf882decd3c248471ef0b7df260530de4e6eb0564259bf1029755141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D54 10180 bytes

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