Malicious PDF — malware analysis report

Static analysis result for SHA-256 a400c9e925660896…

MALICIOUS

PDF

42.8 KB Created: 2020-08-01 13:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3903da07f4c278829be52881f3707b0 SHA-1: 2a7f3f66cc9207af52f5e997025b97503e9d7011 SHA-256: a400c9e925660896a6a2f4e856eea7f829d5c0e45fa4ee56ad19faf892adc14e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.com/pify?keyword=college+physics+etkina+pdf+download', is flagged as a malicious redirector, indicating a high likelihood of leading to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=college+physics+etkina+pdf+download
    • http://files.nofires.net/uploads/1/3/2/6/132696249/bakigazesakegoxu.pdf
    • http://files.stylezbyomi.shop/uploads/1/3/2/3/132303020/946843fca.pdf
    • http://files.pspathletes.com/uploads/1/3/1/3/131398088/puzusizizenukuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/92040288954.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/wewilozimojes.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/tipesitesituz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/93337496199.pdf
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/vikizufewekozanozexaxafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/93880696080.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/27074240925.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/20624212985.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/dusofivib.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/68267693511.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/86153491439.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/50527311209.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_off000066d2.bin
407ae808d0fedc2b6fdb0274d90fd087ad092b2c5b29e534e7e5168af110fe0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 5484 bytes
font_01_sfnt_off0000799b.bin
fc4e5c2e1d6d41bea060f77d51db37e9330166980c8eb1f25c827b00200eb264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 10852 bytes

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