Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88d6e0523b4bc4…

MALICIOUS

PDF

48.1 KB Created: 2020-07-28 17:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa75cf982b981933b2f773600f8a6d12 SHA-1: 51d3e99edb1cb6cc7f487222ebe9e6cce29a00a1 SHA-256: de88d6e0523b4bc4766fc2fd8fe8117b0d2978c1d2a323b7de41b221cce15a2c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Another heuristic flags the PDF as a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link-based attack vector.

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=botellas+de+agua+comestibles+pdf
    • http://files.drivershieldasia.com/uploads/1/3/2/6/132681295/monagafituneno_wejitunu.pdf
    • http://files.impact7generations.com/uploads/1/3/0/8/130813923/37abbafa.pdf
    • http://files.stuntlady.com/uploads/1/3/2/8/132814589/vitosuwi_fusivuz_mokabo_jubaze.pdf
    • http://files.afmxschool.com/uploads/1/3/1/6/131636834/2622799.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/solosifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/modumuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/muvamedoxanuxitemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixozuxixewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/46543189445.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/banawixem.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/xidisidiwijirole.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8674/files/55755668423.pdf
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/76292502069.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/35991706599.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/85167201716.pdf
    • https://cdn.shopify.com/s/files/1/0433/8145/7061/files/18057434891.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_off00007955.bin
9aa821e3132606f7f83d593e47430e6a17284f3ba6db499403636982fd8e5f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 5344 bytes
font_01_sfnt_off00008b89.bin
376d780d0bb34ea396cd5f5563885ef781a8ff9c2b0c5a3614ca79287a7aea75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B89 11480 bytes

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