Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36b8331e07703fd…

MALICIOUS

PDF

63.5 KB Created: 2020-08-29 17:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d7bb68cfe6f25ad5032291b4cce142d SHA-1: b6e19d72b7f7715fe2173b7c3799b281e7f2c75e SHA-256: c36b8331e07703fde1edf2f8ee4f1b0834c3478175aaf9e5ead65343f3f0a780
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The primary malicious URL identified is ttraff.com, which is known to host redirectors. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL within it reinforces the attack pattern.

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.com/wix?keyword=henry+james+daisy+miller
    • https://static.usr
    • https://static.usrfiles.com/ugd/b8c837_675826b6c0e14a5c887689b8dad0a5f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd2312a66bca4ca287641161d6b601fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea1298420bc48b79c6021ddc1512889.pdf
    • https://static.usrfiles.com/ugd/b8c837_df4591934a514df1b7f62f3c85e447a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_230c1e8b6a9d45e997fbecb745af5ea6.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/14918029521.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/iso_8253-1.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/water_pollution_control_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3016/files/dodetunirusub.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/43145135968.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/33799776476.pdf
    • https://static.usrfiles.com/ugd/b8c837_92eaa75140484a6493d9ee34bbaab957.pdf
    • https://static.usrfiles.com/ugd/b8c837_544014e9aa8249bf9bfc242ca136413b.pdf
    • https://static.usrfiles.com/ugd/5438e3_b8ca1c6942b64cb19f5ee961f513c105.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_off0000bd22.bin
22d95ef4232f256390f835a86911359eab88726b8556a170948cc808ff30e365		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 5112 bytes
font_01_sfnt_off0000ce75.bin
119dfe49e0b423b80236f737466ae4822bac228cdaa0dcf23797a4c7ea93461d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 10120 bytes

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