Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9bf4eecb465ec6…

MALICIOUS

PDF

55.2 KB Created: 2020-08-31 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b65aaa7bf9bbdd376479e83f2a43b72 SHA-1: 2f691cb1018223c621f57582dd7d1b289c079076 SHA-256: 7f9bf4eecb465ec64c7adecc817f7377a81ba38fd9cf6497c1f28a054f97df85
120 Risk Score

Malware Insights

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

The PDF contains a malicious link disguised as 'wall mounted workbench plans' which redirects to a known malicious domain. The document also contains a large number of embedded links, many pointing to static.usrfiles.com, which is identified as a link farm. The primary malicious IOC is the redirector URL.

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=wall+mounted+workbench+plans
    • https://static.usrfiles.com/ugd/7ff653_1b9481eb03cd45118482799cee37558a.pdf
    • https://static.usrfiles.com/ugd/e4ff69_b18aa9b60c984ceea2160a13f64a7afd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f5f02556bc54717b8328048df782305.pdf
    • https://static.usrfiles.com/ugd/0adedf_a828b02898be400f8a281dfc94cfbc0c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/acknowledgment_of_paternity_texas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/56093611992.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/21023036969.pdf
    • https://cdn.shopify.com/s/files/1/0440/7384/4888/files/tetogagetetusexebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/reddit_eight_bit_bailey.pdf
    • https://static.usrfiles.com/ugd/e4ff69_499772499b124d82bd8cb05535c522d3.pdf
    • https://static.usrfiles.com/ugd/271e65_f17ed76ee4b44b1fbc3eb9cbcee298a6.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_7a8ec4af82a248349ef9a5f82911a313.pdf
    • https://static.usrfiles.com/ugd/b8c837_47cf9e6eac244b3f9003590006603f2f.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_off000099d5.bin
74809cf21361c4fe1bb0cd65680a64631b0e3d1aee1e9d0cec7d1dc7d744e9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D5 5624 bytes
font_01_sfnt_off0000accf.bin
117fde1ce03b9d3b50b718b4d6b9102729fb24b9ae8afc74232219f25c7847e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACCF 10292 bytes

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