Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d8c99c97eeee13…

MALICIOUS

PDF

52.4 KB Created: 2020-08-30 11:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8480256fc87b488273e098b2e8bd4278 SHA-1: f1621d963e88f098f9194b07a42e902d6b9aab5b SHA-256: b6d8c99c97eeee1308bba2669f11c542550b745c3a63b21989c7d0ce2e833303
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=industrial+production+of+amylase+enzyme+pdf'. This URL is embedded within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The primary malicious URL is the most critical IOC.

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.club/wix?keyword=industrial+production+of+amylase+enzyme+pdf
    • https://static.usrfiles.com/ugd/b8c837_dde8d2c32830414096a45273f73a64fa.pdf
    • https://static.usrfiles.com/ugd/234f58_ec5567fbe14645eab1117917edee68cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ed68ff68d54656877f64cb1e053e6b.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/dogufeges.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_b94406b1533540e9ab9699277d16c7be.pdf
    • https://static.usrfiles.com/ugd/dc98cc_b7895f63b34f49e9891a8b5adf47b1ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_35bd4818978648018c63073c3b3f41d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9acda9ffa934ff98a9452f81e46c4aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d4f1ba48638491d96cd3d366f411339.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/74044867646.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • 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_off00007e2b.bin
afb871abf8eff17274a47d9bf10b0b731f5e9525ae276e829fb714c056f38be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2B 5272 bytes
font_01_sfnt_off00009004.bin
1eee38cfa8d25e90a86710bfb9d47c8080d3166200df73e71076975d037add7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9004 11528 bytes
font_02_sfnt_off0000b689.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 4324 bytes

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