Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f378d6d020d2d…

MALICIOUS

PDF

36.2 KB Created: 2020-08-29 11:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0033d3f2301bba47024b0fd13f1e015e SHA-1: 51dd4972dbb4ead4b67f22099e2a8c4c85d513b2 SHA-256: 790f378d6d020d2d4906155c83f9662b33dba31529e115dc80b24a457e308bc5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one identified as a malicious redirector and others pointing to external PDF files, suggesting a link farm or content hosting strategy. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this assessment. No scripts were extracted, but the structure and embedded links point towards an attempt to lure users to malicious infrastructure.

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.ru/wix?keyword=live+traffic+reports+near+me
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/karel_the_robot_learns_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/aircraft_conceptual_design_raymer.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/51005077786.pdf
    • https://static.usrfiles.com/ugd/b8c837_59343a23c8c142e099bce8d6b319adda.pdf
    • https://static.usrfiles.com/ugd/b8c837_98fbcd487e8d4872953a609484692e11.pdf
    • https://static.usrfiles.com/ugd/b8c837_511bd6ddab0a4d4e842a46824e7d429e.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_45c2892caf6644989b47e2afd91498e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a322527bd40c4432be99b75aae917238.pdf
    • https://static.usrfiles.com/ugd/b8c837_3788ef4b22f04e26b740a3afc9530709.pdf
    • https://static.usrfiles.com/ugd/b8c837_7445b1e66c644936a3e938e07210db53.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd4a7e60274e4d42a243b4931c649e09.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/identity_theft_arkham_city.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/21150068190.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/7405514882.pdf
    • https://cdn.shopify.com/s/files/1/0431/7914/7430/files/dekunituvipitutebetavex.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd3.bin
eed78610b0b4f58ce7b7cb2b43fe1058eba9b83d014924baf46992642a70285f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD3 5132 bytes
font_01_sfnt_off00006137.bin
322eb6c071de65d13fc83eae401c70477f69188451f863a86a6f931c0cbe8396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6137 10236 bytes

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