Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89fb35113f7bee0…

MALICIOUS

PDF

38.9 KB Created: 2020-07-30 21:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b81237583bee60c088c1545cda512996 SHA-1: 2869929cb45150efecb9cc73377afe26883e2fd0 SHA-256: a89fb35113f7bee0e2c28dcdcd2dfb6d99a19ab1de88b49f0eb11d97ce191e2f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. The document body is heavily obfuscated, but the presence of 'Ap enadu news paper pdf' suggests a lure. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ap+enadu+news+paper+pdf
    • http://files.ghumc.org/uploads/1/3/2/7/132740525/waxapivinewax_nuwewoxebuve_zurorumunur.pdf
    • http://files.aerlab.ca/uploads/1/3/2/6/132695569/medogu_lovitew.pdf
    • http://files.shantellstricklanddavis.com/uploads/1/3/2/6/132695492/7880082.pdf
    • http://files.brave458.com/uploads/1/3/0/7/130775378/2652897.pdf
    • http://files.matchboxgreetings.com/uploads/1/3/1/4/131452878/miwiwerapomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/denedomazakubunepuvawozen.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/topevigujofolavab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/1386664240.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/95848504516.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6049/files/5302324565.pdf
    • https://cdn.shopify.com/s/files/1/0438/9175/3115/files/futaxewitinavipapum.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/42209682511.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/nosezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/supugutafozajuxuduzaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/46460767645.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/9449718087.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/7020592032.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_off00005e8a.bin
461215932a8e986e1c1714320b51e5a55bd0448ac748955fa07a8828a50b9df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 4728 bytes
font_01_sfnt_off00006e9d.bin
d738f9c0f10cf95424ad620114f12adcd0ab8a026529df94282935fe22938ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9D 9340 bytes

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