Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed30168a42482c…

MALICIOUS

PDF

48.0 KB Created: 2020-08-31 05:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1058baab5ee7ebbaf3815070436de7b SHA-1: b82c04475b8ad6e207a4094a8f742fdf9b2df4bc SHA-256: c8ed30168a42482c920819e0bc4548d73562d64af3b0c3e9464255bef553b309
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to traff.ru, indicating a link farm for malicious redirection. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking URLs, likely to disguise the malicious intent. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or malware delivery 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.ru/wix?keyword=jazz+improvisation+for+guitar+a+melo
    • https://cdn.shopify.com/s/files/1/0461/9616/2711/files/conduction_and_convection_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/uscis_naturalization_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4311/files/thorndike_s_law_of_effect.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/36771027984.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2be43af29964e2ba49bfb4e466f2834.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3e8427112ef4690b94ea0ce4b491c6b.pdf
    • https://static.usrfiles.com/ugd/fa6f14_008377b56f104802aee67c21890da1ad.pdf
    • https://static.usrfiles.com/ugd/69695d_766848e065ce4acb811341a106c765cb.pdf
    • https://static.usrfiles.com/ugd/e78b77_f322e085c3c443478b0ddd9c2cac8503.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f2.bin
01418cd3ae6844c5e19698e8de1dcf2816a3afa0617c1f7df726dd3119257cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F2 5320 bytes
font_01_sfnt_off00007b04.bin
d1fc8591c8f250812f5cf6d97afdae96021b094f91034616e2460130e9ba91f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B04 10132 bytes
font_02_sfnt_off00009dee.bin
9527d77a8ddbff7143f4b9d9ffa6a9c0a17c14fbd864be9d9139927b2451880e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEE 16200 bytes

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