Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e4b4f6718a8355…

MALICIOUS

PDF

40.3 KB Created: 2020-08-24 16:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c4c86b346f9d6b995954e21b681bc8 SHA-1: a6c5b5d9e17c9b5c0f81d214bea1a067ba159779 SHA-256: c8e4b4f6718a835525d72de4233beac258639aa5d81061254bd255a40efeedd9
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.cc/pify?keyword=canvas++student+groups', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several Shopify-hosted PDF links, suggesting an attempt to lure users to malicious content.

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/pify?keyword=canvas++student+groups
    • http://kimomip.rattietattierescue.com/uploads/1/3/1/8/131856626/6525928.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/tuzukodamifenerap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1126/files/camtasia_studio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/lulumidewazilumogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/79257906067.pdf
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/fagofaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/putaxikijikawekojote.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/katapiwojux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/aditya_hridayam_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/fodibusi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4231/4152/files/namorado_de_aluguel_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5023/files/adobe_flash_player_firefox_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0439/4670/5051/files/wemar.pdf
    • https://cdn.shopify.com/s/files/1/0436/9838/9145/files/92438112306.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/zaluvebemelilanokofaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/bozazixaduxem.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_off00005ff6.bin
ae68f4e26c35a68c99449ef36d0a691590c9b4b6ae5ebada70f20c4c78d1f6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 5060 bytes
font_01_sfnt_off0000713d.bin
27461b681f52ccde5ad2484a4c72e16d6fa9b953460b11e10bf619ddf7527bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713D 10276 bytes

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