Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea71f8f54d23c9af…

MALICIOUS

PDF

44.0 KB Created: 2020-09-08 16:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cddbf4b84439a55f7b1e4a3fa8631d68 SHA-1: 86c294644da7cf97c1d912f4f510abb4d6c0208c SHA-256: ea71f8f54d23c9afc9d41fb5066d1bf52d6f67f1214e32b14265ed0cef0fefb9
150 Risk Score

Malware Insights

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

This PDF contains a mass of external links, masquerading as educational content, to a known malicious redirector. The primary malicious link is https://ttraff.cc/wix?keyword=polynomial+and+rational+functions+pdf, which likely leads to further malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=polynomial+and+rational+functions+pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/anarchist_cookbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7520/files/o_candidato_honesto_2_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/50241472935.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/72454992789.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/concept_art_tutorial.pdf
    • https://static.usrfiles.com/ugd/e8dba5_27db557132ed41b29e26df28b7a7d0eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8c29c79a7f448749bddf96ccd054b96.pdf
    • https://static.usrfiles.com/ugd/fef373_095a7c64137247e58e4361898c70c8ef.pdf
    • https://static.usrfiles.com/ugd/1849a1_d8cf3b8c80d34f2185a9c67500c0aac1.pdf
    • https://static.usrfiles.com/ugd/850f07_c663b8cc688d433583a36dd5399ff83b.pdf
    • https://static.usrfiles.com/ugd/37428b_5e56f216426f4badb13c28fe0571d7f8.pdf
    • https://static.usrfiles.com/ugd/6e3131_4963148bd4674594b72c8eb8f6b70124.pdf
    • https://static.usrfiles.com/ugd/c1108c_4a318be535e543968433b0800f072351.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d73.bin
220538ec008ce0af81458305b177c26c63cfe6d103aeee7b7b10fa758367da8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 5404 bytes
font_01_sfnt_off00007fc6.bin
5e88437e22aba2971e4320d3f366e8b21e6db4150225138e8bce15b0a45ead2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC6 14264 bytes

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