Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4dc1ad0540bb00…

MALICIOUS

PDF

49.9 KB Created: 2020-08-30 03:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d0b2a8e40f05db4eee90c35bb4f1f6 SHA-1: 06540e27efca52eb3140d04486649d98728b834b SHA-256: da4dc1ad0540bb00a00853bbdaa6e353a8102b3b664565b170fa3bfaec178ec2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=american+formal+shoes+brands, which is also listed as a malicious redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting a coordinated effort to distribute malicious content or conduct phishing attacks.

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.cc/wix?keyword=american+formal+shoes+brands
    • https://static.usrfiles.com/ugd/b8c837_4b9746658cfc488088f5c7229684231e.pdf
    • https://static.usrfiles.com/ugd/0047a4_091b3ec708a34d47a119c63dd2c4f50e.pdf
    • https://static.usrfiles.com/ugd/895bef_dfca3b24b6994481aec089d83f9ead25.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/77312322125.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/42591034757.pdf
    • https://cdn.shopify.com/s/files/1/0436/7758/1465/files/wunukebuzunoririxusik.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8595c074e37b47d4983a659b1ce3007b.pdf
    • https://static.usrfiles.com/ugd/0d9a50_6bc6dedf284b4ad593a6a3424c63f4bc.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b505b04ca6ab43aa8b841279c3dc2e18.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec5fffabf6c46e29bee0d0afaadb69c.pdf
    • https://static.usrfiles.com/ugd/9e53d4_252043e534cf4e238b74de0f8da229aa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/14971308509.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/75655475322.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/5367867350.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_off00006f92.bin
6a848662c4df89815089d99bc60cae097f0936c5729649694f307f0a156a8aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F92 5392 bytes
font_01_sfnt_off000081a7.bin
889fde19478dbc49a58efdc7b7dd8444dd56ef9d2e3a615fc7e5df51e4be3b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 10580 bytes
font_02_sfnt_off0000a5f2.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F2 16092 bytes

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