Malicious PDF — malware analysis report

Static analysis result for SHA-256 525ac49aa9240792…

MALICIOUS

PDF

59.5 KB Created: 2020-08-29 21:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa02f703bd96057fc8fb00c2ca6c966d SHA-1: 58528c2b2f2e9109ba77cfe2692b43cc8a8cfaea SHA-256: 525ac49aa924079292e6a6be02d1b0102b21075ece646ca6762b61ff227a6bdd
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a mass external link farm and a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=paris+subway+map+pdf'. This indicates a phishing or scam attempt, likely using SEO to drive traffic to the malicious site. The document body, though heavily obfuscated, also contains the malicious URL, reinforcing the lure. The presence of multiple benign PDFs hosted on static.usrfiles.com suggests a common hosting platform for both legitimate and malicious content.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/wix?keyword=paris+subway+map+pdf
    • https://static.usrfiles.com/ugd/374ce0_4daa05ee7ef1446a940f54c516d875e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c35c8bbe53af46c2904789a125a5edd1.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6dbd13d2b6054889ab524063f99ee698.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/separador_de_love.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/bofoj.pdf
    • https://cdn.shopify.com/s/files/1/0447/8880/9879/files/application_of_biotechnology_in_dairy_industry.pdf
    • https://cdn.shopify.com/s/files/1/0435/6695/6707/files/pdo_to_obj_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1199/files/sample_annotated_bibliography_mla_format.pdf
    • https://static.usrfiles.com/ugd/b8c837_5efe5833b3c54858ac7df3b96a4a7ffc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f6e0a5b89b14037a7c44b6d91043543.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdcfd85f4cf94ac19686e48e7022ee2b.pdf
    • https://static.usrfiles.com/ugd/e5a943_f63fb8fd61384bcc97952be8125b3b49.pdf
    • https://static.usrfiles.com/ugd/b8c837_25be870bcae54319834838de3ad27dae.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_off0000abbd.bin
7482b3cfed64a4d2af7c1588c1b438f8e6673ed49d5a63468c409659c0a08971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABBD 5492 bytes
font_01_sfnt_off0000be5d.bin
1da9fcf2825cbc6f3781131015d9977138fc45bb436f58f607249af34e12aad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5D 10264 bytes

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