Malicious PDF — malware analysis report

Static analysis result for SHA-256 4657409a00d5a535…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 07:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1ee5566007dca565231de1402e3d69 SHA-1: 9e8d5356d5bd246ed62192f8c7f04ab50e4112a7 SHA-256: 4657409a00d5a53510aac8990a95bde46eb92a9d5a8c929222a9ac8532884c05
152 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious infrastructure, specifically ttraff.com, which is flagged as a malicious redirector. The document body, though partially corrupted, contains text suggesting it is a lure for a 'video media player for laptop'. The presence of numerous external PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=video+media+player+for+laptop
    • https://cdn.shopify.com/s/files/1/0431/4926/3005/files/full_detail_of_gst.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1846/files/aetna_pharmacy_paper_claim_form.pdf
    • https://static.usrfiles.com/ugd/89363e_c8a8bb0d0d7c48dc850335154f7e693a.pdf
    • https://static.usrfiles.com/ugd/b916f4_dc085e971c85489f9caf2f3e4a3101c1.pdf
    • https://static.usrfiles.com/ugd/d54300_39163df97f6c457db2ad06eec6753e11.pdf
    • https://static.usrfiles.com/ugd/ad2ade_41877a94c4444053a7d5f0a96e741e5d.pdf
    • https://static.usrfiles.com/ugd/f967ac_99fd6e6bee2b4f9982ecb886fc9de0d2.pdf
    • https://static.usrfiles.com/ugd/2c608b_972c936416784066923e25e995a95486.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_off0000657a.bin
168ef4c29dc20cbb03729255031a48ca2e4cee729a45f1ba1fa8a5d4852c4b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 5076 bytes
font_01_sfnt_off000076b3.bin
469b8f5ced0d99731ddc58e5ffca6a337625333161878cc119e6ab9faae981a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B3 10116 bytes

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