Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bffe2110347f8f5…

MALICIOUS

PDF

42.5 KB Created: 2020-09-03 20:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a186235ce24e5fe47c087d03031595d SHA-1: f76493aa8957815f9f82fbaba1f80d935f24f15e SHA-256: 9bffe2110347f8f58417c9a000dd14b457545721ae075870d3509bace4f97e71
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.me, which is disguised with a seemingly academic keyword. The PDF also contains a large number of links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL and the link farm indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=peptide+bond+formation+is+a+hydrolysis+reaction
    • https://static.usrfiles.com/ugd/d162e3_2026decaab5349b8bb1f92f06dbffa44.pdf
    • https://static.usrfiles.com/ugd/930050_bb1faec7ad8649358168fcac3a3c9d9d.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_e469e3301a6947f0b51551ce08f87a00.pdf
    • https://static.usrfiles.com/ugd/b8c837_71baf34b07de4a609da323efc26e6da5.pdf
    • https://static.usrfiles.com/ugd/6846fe_3321551ec45640c09b9397077c2600bb.pdf
    • https://static.usrfiles.com/ugd/930050_502686f7bf22498890fae06b6d5cf990.pdf
    • https://static.usrfiles.com/ugd/cc03df_741182c4a9c24b8a853d1ac4de8e9f66.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_f904a0a7fda946e5aa1b85682fd61bec.pdf
    • https://static.usrfiles.com/ugd/7f614e_a3825168e71d46ec8d91bf31d6adde51.pdf
    • https://static.usrfiles.com/ugd/b8c837_754389c3fe49474483e0c5960eceea09.pdf
    • https://cdn.shopify.com/s/files/1/0462/5730/7797/files/chahun_main_ya_na_guitar_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0463/6943/9899/files/icloud_activation_bypass_tool_free.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_off000067ae.bin
2e8dfd604fd728be83bcf23396c4995a4f4ca6297efc50b2f6cd5afe02d41313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5640 bytes
font_01_sfnt_off00007ab6.bin
2b5d94acc4c289164a6a78d0125e069e81fe5e114691ce2a4f34687084a13a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 10040 bytes

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