Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ddba2b8d023f9b…

MALICIOUS

PDF

51.5 KB Created: 2020-08-28 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33cb84a5ee38d9b703129f44183bb82 SHA-1: 6c2d5706eee2027234aa30441f0201f8bacd9010 SHA-256: f8ddba2b8d023f9b4e3e4dbb30cd85d3f939856ef02a494e5837ab5ae8d0d358
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is ttraff.com, which is likely used to obscure the ultimate destination of the attack. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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.com/wix?keyword=the+unwanted+undead+adventurer
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/43927715025.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/80823716040.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/domiziwomidigefivejix.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/java_hangman_game.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/zepowewudunefig.pdf
    • https://cdn.shopify.com/s/files/1/0440/9524/2392/files/borevafujitadowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/parifedew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/ginuximatexuvexeroji.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/votij.pdf
    • https://static.usrfiles.com/ugd/b8c837_f034b80f0d474d84949620da31371891.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d288e799504b99958d9226f29c1549.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1850561e9a84fc1acdab69ed9269913.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae2353dbd8ff440390744f326616ca06.pdf
    • https://static.usrfiles.com/ugd/b8c837_abebc3777b5b4a4f8867a1f155e4821f.pdf
    • https://static.usrfiles.com/ugd/b8c837_085437aa8ead483f82bd694a5c504171.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1c67659093413da620fc3c1c1b5d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_259b529153ee4d06878348b75a9551b3.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_off00007ba0.bin
1b8cd4a2731bc3806de3c665a1c987115b444467348bbca874e6db95f0c03738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 5064 bytes
font_01_sfnt_off00008d67.bin
e7e45cabbf8573007b281e447155782f585e1edb51843eae7eaadde5fb5abcbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D67 4804 bytes
font_02_sfnt_off00009dcb.bin
90838d4b212e4fb8570f3b117296d3f174069d29b1701561aa70dc39b0c8a4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCB 10120 bytes

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