Malicious PDF — malware analysis report

Static analysis result for SHA-256 38369a18f6097ceb…

MALICIOUS

PDF

40.3 KB Created: 2020-09-18 07:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004abeaa25f0f99fac6de0076cdf3083 SHA-1: 642a3f43ff8eb7edb6001157d1affb3e9d6057d5 SHA-256: 38369a18f6097ceb8e70f249430f0be16c2128048a94004157ad1a5246c5eefc
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.me/wix?keyword=tony+tung+wife'. This URL is the primary indicator of malicious intent. The presence of a large number of external PDF links, while many are benign, suggests a link farm or SEO poisoning attempt to obscure the malicious redirect. 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.me/wix?keyword=tony+tung+wife
    • https://02de124d-e6de-4beb-b89c-416973dbea66.filesusr.com/ugd/b65acf_f2873a9dcdeb405384362614c0fe01bf.pdf?index=true
    • https://077651fd-f2d6-4213-8b08-960f7e1d87d0.filesusr.com/ugd/067ecb_1887f718573748cc84013b56c856bfdc.pdf?index=true
    • https://9665fd1a-2f84-4b27-8891-1b4b8ba7f471.filesusr.com/ugd/a7074a_5e9252f241054500b1bb4fd1346a92e7.pdf?index=true
    • https://bb3ee2b7-bf78-483a-8571-e54c86ce8897.filesusr.com/ugd/9dda13_f4186f661ddc45b5b2968764b6988137.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/direct_inverse_joint_and_combined_variation_worksheet_doc.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/rinam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/horarios_cercanias_renfe_asturias.pdf
    • https://f9870990-727c-426e-86c7-654787b65570.filesusr.com/ugd/cdfdba_6061447164ea4661af2fa5fb8617f577.pdf?index=true
    • https://e394344b-acc5-4c29-a173-9f3b62cdab01.filesusr.com/ugd/1e11d0_59da89ca95a24976a306e0466482a2d3.pdf?index=true
    • https://b74abcf1-5606-4b85-8056-88166de0b268.filesusr.com/ugd/2486b5_4ba837de7a434c6b87c5d14d5e750aa1.pdf?index=true
    • https://73be79df-9421-4d7c-9629-109113bf0ab7.filesusr.com/ugd/6f5f23_21f8c51477ca4fdbad5506dff7999ece.pdf?index=true
    • https://b29e27fb-0b5e-470d-8d3a-398c74d0ed6b.filesusr.com/ugd/405339_af66557d9fb4440c86cbd115ddf51319.pdf?index=true
    • 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_off00006281.bin
767a6b979fc6a4b9b6d4e3e26e9c9b34aed7f703cc8700742d7b0ec02c4fb77a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 4564 bytes
font_01_sfnt_off00007240.bin
08d2a55f649bc045e13b072945112cb824dffb3e56d90a46ab2c1010e9323307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 10232 bytes

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