Malicious PDF — malware analysis report

Static analysis result for SHA-256 491bdafb611d4505…

MALICIOUS

PDF

51.8 KB Created: 2020-08-29 07:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 485fda9c42d53d5fd824821962104273 SHA-1: 9d05d4c9405bcc241b5c6895c5c702e7a2b5ecad SHA-256: 491bdafb611d4505b142f634568d50b3610cdb18248c413aff7b6be3134843af
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.com/wix?keyword=espresso+english+review', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of numerous other links to Shopify and usrfiles.com domains indicates a link farm strategy. No scripts were extracted from this sample.

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.com/wix?keyword=espresso+english+review
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/17313599263.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/warframe_atterax_build_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/21760915321.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/osha_illumination_standards.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/31537345447.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/vikigenen.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_dddc3f59f09c4d07bce77264278fd212.pdf
    • https://static.usrfiles.com/ugd/b8c837_12918248429a48a5a194bf0ac226cdbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2bdaabe6eac49cabe9427dcaf520c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_702437aa5afd4e388172c573124b41df.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.pdf
    • https://static.usrfiles.com/ugd/b8c837_008bee43db9540d2b6c9e90f9e2b8e90.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_off00008c7f.bin
77bfb0c2f4579f1f7c0826b2969543e0ba584e51057ce74260d7b17c0e38e761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7F 4980 bytes
font_01_sfnt_off00009d8b.bin
f680b2c416d31feedfcc831e7c7a5d6fe7a03fd24cd0b20bed6c29009f1a239f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8B 10752 bytes

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