Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a2ac1603cda50…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 00:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e592a016e22cd66496e42590e289cacb SHA-1: c2cb1e2120f27962249bdd9986f0e638ff7383d6 SHA-256: 9c1a2ac1603cda5040b603018f22f8703fe1719a80d429cc86dc87f9ba18266d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded external links. One of these links, 'https://ttraff.cc/wix?keyword=modulo+volumetrico+formula', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to 'static.usrfiles.com', suggesting a link farm or redirection strategy to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=modulo+volumetrico+formula
    • https://static.usrfiles.com/ugd/f3cb45_7c801ac01d6646e185fb82ec0963be1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a68b588fcee4f509b10402ac94df59f.pdf
    • https://static.usrfiles.com/ugd/05900a_eebd5a6e78ee477aa42bd9141ec5e785.pdf
    • https://static.usrfiles.com/ugd/735189_3edd2927ded4404e8cc3d1ece1aca0aa.pdf
    • https://static.usrfiles.com/ugd/217d68_b5d00d24654a4cbb931b9dac72b023d1.pdf
    • https://static.usrfiles.com/ugd/39cb9d_6fa7c318d5c24f18b1978db5e82645f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_92a9a8818da742069e763b7a136ede4c.pdf
    • https://static.usrfiles.com/ugd/22bf55_cca4d0e429e24e87b3f5249d4343b833.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8568136b54e40e9908a735065c2a094.pdf
    • https://static.usrfiles.com/ugd/b7ed05_8dd7769e6ae94821aa72dc8716de6249.pdf
    • https://cdn.shopify.com/s/files/1/0464/5231/0184/files/25951524783.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/employee_appreciation_awards_templates.pdf
    • https://static.usrfiles.com/ugd/93c935_6c845d85603e45e8b8284de2764c8980.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2787976b83f4da9942292be51d2a524.pdf
    • https://static.usrfiles.com/ugd/db1da1_1246780d12374c40a8974e777900d24b.pdf
    • https://static.usrfiles.com/ugd/3b7182_c787a234cc5a4d8f97ea5ba40d6a168b.pdf
    • https://static.usrfiles.com/ugd/b8c837_184f284dc41c41738d9cb2833859b8bf.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_off0000625b.bin
2df7e2ae08e526b665b46a5acd1b1dd63ce407cfb14724dbbd9056f47884351c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 5056 bytes
font_01_sfnt_off00007382.bin
c57a8b1c306e0864c9b55690d22ca1a2ff54d956e3bb5b1aa1ba6fea53375b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 16396 bytes

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