Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b3c1d267409cb…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 14:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8bf82e40e052ca529d843d2821fb77 SHA-1: c7fb9ae13e3038fb8724f27298007d3be884067d SHA-256: 4a6b3c1d267409cb25df288ecabccf5657cffec8710bd5aa45f875f922add9cd
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to host SEO-optimized PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. No scripts were extracted from this sample.

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=char+broil+vertical+gas+smoker+595+manual
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/majukapelol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6370/files/47259817944.pdf
    • https://cdn.shopify.com/s/files/1/0451/0269/4563/files/biodiversity_and_conservation_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/39862538501.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/83261079888.pdf
    • https://cdn.shopify.com/s/files/1/0433/6625/2703/files/inovix_ipocket_manual.pdf
    • https://static.usrfiles.com/ugd/ac72e0_1487c4a5e5644fe5a721cabedc144544.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_d8ed87b746b6490cb9d395b6d5c27b74.pdf
    • https://static.usrfiles.com/ugd/b8c837_3960b0e47166470a835d2421d50ee26f.pdf
    • https://static.usrfiles.com/ugd/b8c837_263d4133e17c4f9e95aaa360348159d3.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ed07978649e342c7b3eb9afec86abc9d.pdf
    • https://static.usrfiles.com/ugd/221f3a_c46846bc0caf4983ad4f804c60779a46.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf2b371bcc72483caeeb6e56aeef2e0a.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_off00005dea.bin
88ea6fadeca81032091c78ab46986344f5b7685be2fcb3d362ac34489cd953cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 5664 bytes
font_01_sfnt_off00007107.bin
9357ed6e414165b85047a68f7d99d1edbcb5c053646d0bf9cc2790122499dcf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7107 9916 bytes

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