Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5bc50d35570eea…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 13:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61cd6665d7358f52a1ab7a11a9b56428 SHA-1: cc9288b8ebd55e374d0328661a56e96920b3f840 SHA-256: 2f5bc50d35570eeaec376566e23897c82acd12b9ef2cea26726328205383c664
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a link disguised as a search result for an ebook, which is a common social engineering tactic. This link, 'https://ttraff.ru/wix?keyword=systems+architecture+7th+edition+ebook', points to a known malicious redirector. The document also contains a large number of embedded links, many pointing to 'static.usrfiles.com', suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of a malicious redirector and the social engineering lure are strong indicators of malicious intent.

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=systems+architecture+7th+edition+ebook
    • https://static.usrfiles.com/ugd/bb13a2_105350b8ced94fc8886f887adf78005b.pdf
    • https://static.usrfiles.com/ugd/77eba6_5933b517673a41bc883fb590c3981d94.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05f146b81c2431ca25b7161eda455d1.pdf
    • https://static.usrfiles.com/ugd/dc51bb_a5f9116ed8df4b9daf97ddfc9f28548d.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_860d2b5677b143c79fa386094450408c.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_23ecb2ba3d5c4680862e653473843d3d.pdf
    • https://static.usrfiles.com/ugd/086daf_93b7ab0e3a3844fea8780ab3d293fe71.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/glandula_de_bartolino_inflamada.pdf
    • https://cdn.shopify.com/s/files/1/0435/8569/9997/files/vuwexukoxet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/magazine_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/warugeliw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/36920304184.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_off00004ab3.bin
ce75437eeeb77a7775966fd073d48d2a05b31198556b63459b8780a304be7f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB3 5636 bytes
font_01_sfnt_off00005dbc.bin
50d98b48546ffb9ff3b982b18d9342c03e5f4cfe4b6003260a86175be4dc4e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBC 11132 bytes

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