Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4013e91ec0056d…

MALICIOUS

PDF

77.6 KB Created: 2020-07-28 08:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57956667d553f27156b8e5b8bc6f33d2 SHA-1: 4e107dbb83a4e1f38a897743298effd083c15cbf SHA-256: 4f4013e91ec0056d2779dc429900eb6b566efb5197a34933be94220e11064d05
120 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 a PDF link farm heuristic, with 16 external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=king+air+350+poh+pdf
    • http://files.mygrmobilervrepair.com/uploads/1/3/1/3/131384777/8090319.pdf
    • http://files.khhcommunications.com/uploads/1/3/0/7/130739369/bajenixira-fikikitebiseza-duridogotipi-jijolekafofot.pdf
    • http://files.dawnlyndiehl.com/uploads/1/3/1/3/131380627/sapasolezawud_doteb.pdf
    • http://files.porthcawlmuseum.com/uploads/1/3/0/7/130739719/4416333.pdf
    • https://cdn.shopify.com/s/files/1/0435/7256/0031/files/66765568021.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/temagulaxebisepufevilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/9859382866.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/29479898958.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/96370193321.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/51424166553.pdf
    • https://cdn.shopify.com/s/files/1/0431/7256/1050/files/93821155436.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/21320395903.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/16898642138.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/xeruluzitalagatalorotot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumuwajufutoz.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_off0000e7ae.bin
0818e66987d9021ce0a7e3936f1cd93faee6a2d4ad6b5ffb0dc00e36dccd25b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5084 bytes
font_01_sfnt_off0000f8dc.bin
85dfd411fa2ddbc1b76bb3740f3c5fae6f260cc69feb493b6ebb1a7a46923ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 15500 bytes

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