Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6b37f1c29558e4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 06:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04c7540dc6c517601970b661c287fbda SHA-1: 5b09720e51db62442bfa4c5e92c545f330c258cd SHA-256: df6b37f1c29558e4e138fd89a980715e74b4f588eb080a6284c525f4a1a566f0
150 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 'https://ttraff.ru/wix?keyword=nvidia+gt+720'. 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 heavily obfuscated, contains the malicious URL and references to 'Nvidia gt 720', suggesting a lure to a malicious site.

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/wix?keyword=nvidia+gt+720
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/30816086202.pdf
    • https://cdn.shopify.com/s/files/1/0430/3935/9127/files/14980896343.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/networking_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/how_to_install_hadoop_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/90031320408.pdf
    • https://cdn.shopify.com/s/files/1/0437/9977/3341/files/unsuccessful_job_interview_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/55806107841.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/59994220317.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3925/files/9789475370.pdf
    • https://static.usrfiles.com/ugd/b8c837_0265392217ca4d0c9113f8cf1b3a9dd3.pdf
    • https://static.usrfiles.com/ugd/9a242c_151c3a6b5e754d81ba8a15d2ac9b628c.pdf
    • https://static.usrfiles.com/ugd/d216cb_8234e502295c4fb483910b7739df1e39.pdf
    • https://static.usrfiles.com/ugd/b8c837_b04b151de58545ecbe6dbab3f5d30991.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_off00006780.bin
ed84396be00608517010ac62ddf08a455f85aa742fca10656e96cc0df819e228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6780 5068 bytes
font_01_sfnt_off000078e8.bin
99be47e472f161d4e24ffa75def5a5b1fc36ef2ab1130619288143d26f1d4941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E8 15096 bytes

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