Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c563ed1ce7c460…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 08:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1f054c1694a55e5e6313fdec494172 SHA-1: b78779d29ff2bd27f0cf42937ebe154dce0b9553 SHA-256: 96c563ed1ce7c460490329e6f577f91b65dea3cd99e7d8c5d1ec1c9e03b47f19
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=r+export+dataframe+to+csv'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0435/6138/6147/files/fepaxozovexulod.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains these URLs, reinforcing the malicious intent.

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/pify?keyword=r+export+dataframe+to+csv
    • http://files.drmpositiveperformancecoach.com/uploads/1/3/2/6/132695575/419930.pdf
    • http://files.the60four.com/uploads/1/3/0/7/130739987/bufewejeje-zuturuxururikuj.pdf
    • http://faxulaf.seaquamseahawks.com/uploads/1/3/1/4/131406082/e36d24ab2c5e.pdf
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/fepaxozovexulod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/37437032030.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/96267375044.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/79988536014.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/likizokago.pdf
    • https://cdn.shopify.com/s/files/1/0429/7746/0383/files/04_acura_tl_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/dujurifer.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/83657617589.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/93210345591.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/8752744583.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/74909209425.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0431/5634/0890/files/8422727501.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006541.bin
93f75a4447585d451a7dc6eb53e54fd3ab56e1ce3d3616e7f50a1658c5dff42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6541 5040 bytes
font_01_sfnt_off00007675.bin
e631a0e1e776af2b470399f27e9e5ae656e1af250c709b055319d3ba054fcd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7675 9992 bytes
font_02_sfnt_off000098ac.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AC 4324 bytes

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