Malicious PDF — malware analysis report

Static analysis result for SHA-256 6598cf8dae1e9484…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fae8b9879c5f0470f71ce320651d935 SHA-1: 7f87d8758bc49b3c7022908dd693a716a752b21b SHA-256: 6598cf8dae1e94842beabe112b4f0c6c7b41132df04c3215c91704be1e57257a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is 'https://ttraff.ru/pify?keyword=certificate+of+origin+form+south+africa', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and references to other PDFs hosted on Shopify, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier strongly indicates maliciousness.

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/pify?keyword=certificate+of+origin+form+south+africa
    • http://xonedi.minniefairytales.com/uploads/1/3/1/3/131383483/fudapapakor.pdf
    • http://files.jtdentalgroup.shop/uploads/1/3/1/3/131384127/2271165.pdf
    • http://files.denverchinesesource.com/uploads/1/3/2/8/132814544/dovokukumowepiwaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/tiluziseliz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/difumusotid.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/kisaginuromerelapowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/pathfinder_halfling_opportunist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4207/files/45150836933.pdf
    • https://cdn.shopify.com/s/files/1/0445/7860/3172/files/marketing_research_for_mba.pdf
    • https://cdn.shopify.com/s/files/1/0434/7114/3078/files/wuzovedubogejumowuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/gesikifinakejesow.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/93716857882.pdf
    • https://cdn.shopify.com/s/files/1/0429/2208/2460/files/46971750904.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/40939670336.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/51522947442.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d8.bin
d58b29d5a3bd36555a4942024dea060f8ea1a515fc5c0493946e7958630fd62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D8 5168 bytes
font_01_sfnt_off00007a39.bin
20a5e9584e8a42ca5fe16a9dbfa97a98ed59a9a7b44a740df342926822105b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 10912 bytes

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