Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da7c23fdc5dab3c…

MALICIOUS

PDF

50.6 KB Created: 2020-09-02 17:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ee9f4416d3f4fadf5de0ac152b6793e SHA-1: 9d66178aedf5831d5aaf8d250c616e67769e7952 SHA-256: 1da7c23fdc5dab3c77792b0e9cd2ec5f2bfd22be25e25774a4dbacd872166497
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on static.usrfiles.com, which is indicative of a link farm. The primary malicious URL, https://ttraff.com/wix?keyword=jumbled+words+quiz+with+answers+pdf, is identified as a redirector. The document body, though heavily obfuscated, contains references to the quiz lure and the malicious URL, suggesting the intent is to redirect users to potentially harmful content. No scripts were extracted, and the maliciousness is primarily driven by the link farm and redirector heuristics.

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=jumbled+words+quiz+with+answers+pdf
    • https://static.usrfiles.com/ugd/a107db_6c90f0560aa14829a47611f0a734051b.pdf
    • https://static.usrfiles.com/ugd/c34aa9_a7c1fe127617418cb8e05f20f96efdbf.pdf
    • https://static.usrfiles.com/ugd/cdb50c_31eda7f13a9c47d2b4e437b782fe1c0c.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_b625be3c958845e3bb9718b28b2e3c87.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/swift_random_number.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/54272393696.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/negufedofepideka.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9728/files/70727596312.pdf
    • https://static.usrfiles.com/ugd/808d8c_a7e81ef03cb240d4b94cb5d5fd067105.pdf
    • https://static.usrfiles.com/ugd/09c3c7_a23fce66529b4dd5a2e20c0276389944.pdf
    • https://static.usrfiles.com/ugd/b8c837_018c0f3770224496953b0396ff042ee8.pdf
    • https://static.usrfiles.com/ugd/46429b_3a1117c77c814afba4196b4fa573e1f6.pdf
    • https://static.usrfiles.com/ugd/0d2908_d4d020506c8247159097c384fc4164b4.pdf
    • https://static.usrfiles.com/ugd/7ff653_fa8e489a11cf45fcbeb502ab6028afcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://static.usrfiles.com/ugd/6116da_e18693aafa4c46768dd1ff4b8694a8a6.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006293.bin
ac1f085ca61639d3e801a5c2fc01e8811633ded2c3f3670e63c039ac19e21c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 5560 bytes
font_01_sfnt_off0000755f.bin
13f535de641ac35001fa360a41df9cb1c4bde8aa56a410884fd8e12273e9166e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 10588 bytes
font_02_sfnt_off00009992.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9992 16164 bytes
font_03_sfnt_off0000aea9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 4324 bytes

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