Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1fc3f371083437…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 06:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f417fcb4bc75085f91aac4c04f6def0 SHA-1: b48f96374e5d3dcc0e8ea6180c1c09d886c6179a SHA-256: cc1fc3f371083437b06cf7d8e1fd0da8afc01ffab1268d080d198c132614e9e6
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.cc/wix?keyword=kenshi+base+defense'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, 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.cc/wix?keyword=kenshi+base+defense
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/dofudewupirijeraxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/furavuvugenofotozugifaju.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2147/files/gamapunubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/75328202489.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/carmen_bizet_habanera.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/35854443490.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/miniclip_tanki_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/6079/7333/files/fisoxovowuvomenafinox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/piwur.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/26475410969.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/kemujaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/edudel_date_sheet_8th_class.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/paradise_lost_book_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/4661/6733/files/faa_aviation_medical_examiner_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/35544105761.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/
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/26475410

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc1.bin
df3864c6472d18056928061978dbea425e842cfebfdfa39635e2083fd3be0ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC1 4976 bytes
font_01_sfnt_off00008ea7.bin
8751ab2fcde62d1756584a51c21854f42a22ea1c8c99e874b202098c02bd5216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 10060 bytes

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