Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad9312912c45dcf…

MALICIOUS

PDF

57.9 KB Created: 2020-08-04 10:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc8bd581c4bd2bade07234f1c1d02c3 SHA-1: 415f94b9d273a57693f89e82eb656b1dadaa6a16 SHA-256: 8ad9312912c45dcf6edc8562cd679edfcdfa5bd626ddc2c814f7699f1d5522f0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.cc/pify?keyword=budesonida+nebulizacion+pdf'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with 'https://cdn.shopify.com/s/files/1/0427/8022/9791/files/tapuje.pdf' being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the malicious redirector.

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=budesonida+nebulizacion+pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.monitor-io.com/uploads/1/3/0/7/130739343/tegalukutiwe.pdf
    • http://files.theessendonhotel.com.au/uploads/1/3/2/3/132303013/mimozemamasox_vifokedip.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/tapuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/american_english_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/tunapusazubudigamiwedodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/sebozolalazegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/50159380993.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/vorediti.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/guvub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/weather_forecast_newark_nj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2783/2733/files/587584569.pdf
    • https://cdn.shopify.com/s/files/1/0436/5792/0677/files/da_form_137_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/pivajerijibuwibigifipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/62212828073.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3057/files/23718194293.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_off0000a2bd.bin
28c018f8abac30f391c5a3739a7e9a3b6b24cdd8ca8f99e4d5255791498f51c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BD 5292 bytes
font_01_sfnt_off0000b4d8.bin
da6028f7d66c9da42d292a70dd4915e2fa15b80d685c63e44aa48b2770c309f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 10988 bytes

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