Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed90afe4b43257…

MALICIOUS

PDF

46.3 KB Created: 2020-08-07 12:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117a98687348cf3e6d516c1525f8532e SHA-1: 10593b539deb7657c4e04e93223f9d24c219a118 SHA-256: c9ed90afe4b4325763b87d44108a02016a89744b1ce50eddf4d08e1e5b913a8d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and a reference to 'wkhtmltopdf', suggesting it was generated programmatically to host malicious links.

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=8086+addressing+modes+with+example+pdf
    • http://files.queensofcountry.net/uploads/1/3/1/3/131398555/sudevokas-rurajowip-xevisefi.pdf
    • http://files.carlsingletoneconomics.com/uploads/1/3/2/6/132681670/zabijebibaf_vulonazegiwazu_doxefop_fuwabagodejo.pdf
    • http://fatoj.peakperformancefitnesstx.com/uploads/1/3/1/6/131606069/ec5d5cb36e980a0.pdf
    • http://files.runnerstoke.com/uploads/1/3/1/4/131406344/3cb96331.pdf
    • http://files.sagerootsbirth.com/uploads/1/3/2/7/132740693/bukojebiloxekebuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/titixupunewebixaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/wazowoxupezal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/16813714121.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/44660324059.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/81654521898.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/fusionner_deux_documents_en_un.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/57988761221.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/arboles_frutales_de_clima_templado_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/dizegaxuke.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6225/files/kewonidazusoperatori.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/generally_accepted_accounting_principles_with_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb5.bin
27c5c161509e7a963dfb0137c39da83715b70fd35fd8cf949aa73aad6ab046f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB5 6012 bytes
font_01_sfnt_off0000740e.bin
b5bf351cb52acd29caa91756775b0e2a82570f3498ae57d0b7c1513037b8925a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 10164 bytes
font_02_sfnt_off00009704.bin
ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9704 16088 bytes

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