Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf3c5143f4f0c5d…

MALICIOUS

PDF

59.4 KB Created: 2020-08-30 07:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd99113f269ac08bc6af20d1c2c8a4a SHA-1: e41f0425b034aec5de3dc9a12bcbbdaf040b3cf5 SHA-256: cbf3c5143f4f0c5dbbf671c61a052c0bc2857313a6b794ecc8f66ff0844b7179
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.com/wix?keyword=el+codigo+enigma+pelicula+completa+en+espa%25C3%25B1ol'. The document body, though heavily obfuscated, contains this URL and text suggesting a lure related to a movie title. The presence of numerous other PDF links, while many resolve to benign Shopify domains, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=el+codigo+enigma+pelicula+completa+en+espa%25C3%25B1ol
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/67822084493.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/wejigizoribiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6538/4855/files/jevedapuxerujakoremuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/19356118029.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/nudurajevopapunubo.pdf
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/1283018808.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/47831050273.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/jufuzame.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/vebixedafatipop.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/el_catecismo_del_revolucionario.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/perimeter_and_area_questions_for_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/ruxubazew.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/49293598043.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/1/0431/6538/4855/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3fc.bin
f52056ad7d654931aa9df40e51a23b7c210b1f241adfdfb1aeeba2252418fcec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FC 5464 bytes
font_01_sfnt_off0000b638.bin
0640d735762e698180416ea6ea7ebb87eb1af1cc4216a4707fe013f533260e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 12176 bytes

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