Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bc4878a4fe9e3…

MALICIOUS

PDF

54.2 KB Created: 2020-08-10 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa2c655da627ccec938cdd15bc3c808f SHA-1: fc6b26dce2fcc3363b24442ff7b878f059912dda SHA-256: c83bc4878a4fe9e379daf5dc170cc5965916727dded65ff4d71fd07ee5d05734
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at 'https://ttraff.cc/pify?keyword=smoothies+for+weight+loss+pdf'. The document body, though heavily obfuscated, contains references to 'smoothies for weight loss pdf' and the tool 'wkhtmltopdf', suggesting a lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful destination.

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=smoothies+for+weight+loss+pdf
    • http://files.seasideherbsociety.com/uploads/1/3/1/6/131636748/segigel-warabuvipov.pdf
    • http://niwezogus.toffears.com/uploads/1/3/1/4/131483254/1419781.pdf
    • http://files.washingtonheightsyouthfootballleagueinc.com/uploads/1/3/1/6/131636841/985252.pdf
    • https://cdn.shopify.com/s/files/1/0429/0114/3715/files/7430348726.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/jazitusuvuju.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/biological_activity_of_benzimidazole_derivatives.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/pekipubisoxur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/82459693043.pdf
    • https://cdn.shopify.com/s/files/1/0439/0069/8792/files/jafoxekiwutad.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/49750188062.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/80891317031.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/83863297804.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_off00008953.bin
130f670c247fa17290b104ffa4d954435f7c86bcc8335f199b2103f348cec879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8953 5120 bytes
font_01_sfnt_off00009acd.bin
fb074f3ff987b41b7b27e5115d5e92457434a65fc124880afa4756519cea2790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACD 10240 bytes
font_02_sfnt_off0000bdd9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD9 4324 bytes

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