Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c8e8b1e9fb79ef…

MALICIOUS

PDF

38.1 KB Created: 2020-08-30 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0cefa0d9db48b5dcbc0e581864ba941 SHA-1: ea257cbe69010e87891b2a19f68775456ed3434e SHA-256: a7c8e8b1e9fb79ef8ba1e75539001d459900dc877f262049e6602061400c41e2
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=la+silla+de+plata+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site via the embedded link.

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.cc/wix?keyword=la+silla+de+plata+pdf
    • https://static.usrfiles.com/ugd/d3758e_2ae9a3c95bad48b6bb8db1fbd001a638.pdf
    • https://static.usrfiles.com/ugd/b58d21_9295514f79764b56b72d47b54f837de4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a9ccaf4b064448a86884bd602857cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c8ef90836e44f9cbfe21057f7cca750.pdf
    • https://static.usrfiles.com/ugd/3aca14_1bffb2e6b5544287b078e4716d90e736.pdf
    • https://static.usrfiles.com/ugd/b8c837_49f50439a2954bceb8847135f482ab26.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e65490c53b4a0c88aa030be9b7a340.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/67794873048.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9528/files/mokopizalosal.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/nogibesel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/8425917201.pdf
    • https://static.usrfiles.com/ugd/d94ae5_3b2845eb0399459289161ac99192ff0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0580a59b5d24efdaaf91aa64aa08d9c.pdf
    • https://static.usrfiles.com/ugd/c7a620_a4f208f56f924295bf254b9304e085cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7f93e8b811467cb0ed3ad494484435.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_off00005752.bin
f8446654b74a2414bda420f8064d961678d373dfe75bae7953c8ed26a9865be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5752 4880 bytes
font_01_sfnt_off00006801.bin
85e263eaaa877347d09f0cda55c9930bc900e40d72e4335277d6b4d2b3264bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6801 11064 bytes

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