Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f49acea132b1d1…

MALICIOUS

PDF

43.0 KB Created: 2020-09-03 02:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 562d49f9cd6f5aed4817d283f5985ac4 SHA-1: 52ade559d55e3240f469b526fee2d9cbb3190e3b SHA-256: 81f49acea132b1d15d00aba295529e5b50318dbc449253774f0d49d4cea7568d
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, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. 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.ru/wix?keyword=boundary+bay+airshow+performers
    • https://static.usrfiles.com/ugd/10b11f_cb7b9dcdaa854f06adda346bce363124.pdf
    • https://static.usrfiles.com/ugd/b8c837_02acddd7e40b498da8af23f36e4353ed.pdf
    • https://static.usrfiles.com/ugd/529385_6507f99cb52a4e81a2d0cfbe0409f740.pdf
    • https://static.usrfiles.com/ugd/906e9f_f60bbffe4c284181b1c6fa987dc26211.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6e3535898044bbb9b0d3f5731ef2077.pdf
    • https://static.usrfiles.com/ugd/b88e3d_b9d87c1471744271a861465ca1e673ad.pdf
    • https://static.usrfiles.com/ugd/0e6328_54929c26f88d44a68744e40b8382d706.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_a8913cb8160e420bb14e153ecdf5be6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0815ec8331345a7bc46d36015fc39ff.pdf
    • https://static.usrfiles.com/ugd/dd4472_2ffa470f529a43aa9334de144b75a409.pdf
    • https://static.usrfiles.com/ugd/44b221_9f7e87805ace43ea9ba6351850501449.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/99977620343.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/charlotte_nc_vegetable_planting_guide.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_off00006886.bin
685ebba0fc55518ed7e96744109530211b26fb3c5117158d0d4788e4653af895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6886 5632 bytes
font_01_sfnt_off00007ba3.bin
c6a001ecc07111f7a54563ef37c87850fafdadcc819b3181db92c88443fcddb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 10552 bytes

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