Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b2a0c3c7004971…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee7c546567413efba40dab023297818 SHA-1: d7c3034dd93232bece4d7f00be9fc67eb76a9949 SHA-256: d6b2a0c3c70049710157240a82291c77299c086fbaee8301774842a99af3b1e4
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a job application sample. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS classifier also strongly indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'job application sample letter' and the malicious URL.

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=job+application+sample+letter
    • https://static.usrfiles.com/ugd/b8c837_603c1f8d26f5401094174002416790d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0df0ede68d24257857ef5e4911b38e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0445731655846e8bab94c08dcb1919c.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_308f1ee0b07a461c89d7af9014235011.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_057399472b5c46ccb127b4149d566e32.pdf
    • https://static.usrfiles.com/ugd/39cb9d_85241a27b66a413289ef70373d810a64.pdf
    • https://static.usrfiles.com/ugd/4725f1_ce7a53149add45f98ee6ce1f8dc95f9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e31b88086104db29415b86c1fade428.pdf
    • https://static.usrfiles.com/ugd/cac9e4_af2e9c1fb11a48548c50d616e19d5966.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/table_calendar_2020_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/xilunoxoxeverisivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/davids_bridal_plus_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/91955112647.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_off00005f79.bin
1be089d7ade60110c195dc98ad92af717409c268abfa1fbc837565ee4f96d245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 5208 bytes
font_01_sfnt_off00007109.bin
4e6fd33e8f3fb4224b15244de9b835e38a846c80ca3c1a288ca24bd2c8f29d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 9976 bytes

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