Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f48ff493d17888…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33b414a1f0e5dfff6d87166f1165175 SHA-1: b3dc1fe673604a1df372252936c6812c59075fa9 SHA-256: 97f48ff493d17888a7a6385097c10328b488953b04f11184263b388e05132fde
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, but one critical link directs to a known malicious redirector at ttraff.cc. This suggests a lure to a malicious site, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer 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.cc/wix?keyword=4+gi%25E1%25BB%259D+c%25C6%25A1+th%25E1%25BB%2583+s%25C3%25A1ch+%25C4%2591i%25E1%25BB%2587n+t%25E1%25BB%25AD+pdf
    • https://static.usrfiles.com/ugd/b5aed9_862d1a721b4c4262b73b38e13e843aa5.pdf
    • https://static.usrfiles.com/ugd/79cb75_723689c09db042dca50be77918c88097.pdf
    • https://static.usrfiles.com/ugd/a18aa6_a559f13366b44523acd53d648e1f0377.pdf
    • https://static.usrfiles.com/ugd/bf650e_824ead61007347b5a976d58c7987c782.pdf
    • https://static.usrfiles.com/ugd/5438e3_fe6e9327d96042b7aa71870beb2e7f20.pdf
    • https://static.usrfiles.com/ugd/0adedf_c3933f8cc0424b97a5799336b8f1c805.pdf
    • https://static.usrfiles.com/ugd/fe83c3_3e95821aee8b4e95a95204073305eec0.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2636/files/701719814.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/67260749294.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/toligubuzogojime.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/189669876.pdf
    • https://cdn.shopify.com/s/files/1/0454/6687/8102/files/dependency_development_theory.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4f7ac90e6dd4d6b9195487a5d661922.pdf
    • https://static.usrfiles.com/ugd/b8c837_70c57db51c4244df93590711178b9b6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5abc7c3734184c5c966a4248b73eebd2.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_off00005be1.bin
36ca18168cac4f7874c808991118df0add12b68f1a7cc71127c0894d36995707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE1 6332 bytes
font_01_sfnt_off00007044.bin
b7d655df1a41f1b2498d835185c5d7884bca153db20ae19bb06e1c0f49c75a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 21268 bytes

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