Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c2e076172d243…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 03:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdcefff3507da07cf8c41f3f61868cb7 SHA-1: 89f11e995644f0aab634b9aaf8df9941b5c51532 SHA-256: b55c2e076172d243833a892f20e1895085ff26a49eef694d6c37ecd260c5c311
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/wix?keyword=blue+chips+meaning', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious URL is the strongest indicator of malicious intent.

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.ru/wix?keyword=blue+chips+meaning
    • https://static.usrfiles.com/ugd/764aaa_849104fa28534608a0a298ef2e2a42f2.pdf
    • https://static.usrfiles.com/ugd/8127dd_979328e3e69d43b4a2448adc9bae6fc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c858a73eb3447a9b3c756bf73a9a67f.pdf
    • https://static.usrfiles.com/ugd/98857b_45cc6d52cdd347ba865da7b0ffc1e71f.pdf
    • https://static.usrfiles.com/ugd/b8c837_15844fb1dc5047559324f2132a9ad118.pdf
    • https://cdn.shopify.com/s/files/1/0467/7586/1401/files/malayalam_mashup_2018.pdf
    • https://cdn.shopify.com/s/files/1/0438/5426/6533/files/51235632780.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/80364685543.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/4985/files/calendario_2020_para_imprimir_com_feriados.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/wovikesusevelilajuwizetup.pdf
    • https://static.usrfiles.com/ugd/b8c837_54d4cf8d3a224de9b0cee851fed2f3e0.pdf
    • https://static.usrfiles.com/ugd/7ff653_3c66f97825724568964d2b2398fb77eb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7642/files/dininewosen.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/51526045524.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/gateketawokib.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_off00006b12.bin
b6ac55edb0cce468bab6b92d152cf6963cf33b73799de6f11baf69c51a798365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B12 5300 bytes
font_01_sfnt_off00007cf8.bin
33ef1cbc940f185080fb983169af384c8465a8aa179de1cce1677dfbccdf785c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF8 10448 bytes

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