Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa317e72fb072e0d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 08:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43137e3e398da2e7899d03a5a348e6f SHA-1: bafec5742c461ead73ca3ffbfc3a6811d6a28b49 SHA-256: fa317e72fb072e0d92484168dd42ca1d7117d395418aa1d996ac18a7a787c1ad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=a+world+of+three+zeros+pdf', which is likely the primary lure. The presence of numerous other links hosted on 'static.usrfiles.com' suggests a link farm designed to obscure the malicious destination.

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=a+world+of+three+zeros+pdf
    • https://static.usrfiles.com/ugd/b8c837_94d27aa776bf44f5a4c7e6f533809d00.pdf
    • https://static.usrfiles.com/ugd/9b33c5_08e7f04dcb5b414aaf798cfcd3d51e7f.pdf
    • https://static.usrfiles.com/ugd/cfa91a_8ef36c4a85cb49968626886c02f13866.pdf
    • https://static.usrfiles.com/ugd/b8c837_a97c488d32be40fe8217e8406d7f95f4.pdf
    • https://static.usrfiles.com/ugd/c0b427_c63a57104119482c92db3f77b677bc8e.pdf
    • https://static.usrfiles.com/ugd/d775a9_dd74c7fa583340718c1c5299dff87828.pdf
    • https://static.usrfiles.com/ugd/b8c837_c39186265c9a4e9ab2ad147b54750568.pdf
    • https://static.usrfiles.com/ugd/b5aed9_b4185f88b79b4e1185b0474c24753c88.pdf
    • https://static.usrfiles.com/ugd/ab922d_c5190d1714a446f5a4911c3ca69d0735.pdf
    • https://static.usrfiles.com/ugd/d2751c_bd3f3b4f31aa421ca05eb48dd8406745.pdf
    • https://static.usrfiles.com/ugd/b8c837_00f12b5f256a46199567452546e0d61c.pdf
    • https://static.usrfiles.com/ugd/68ec51_79b54913349041f38560a5e118ac20ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_64682bde39c842ba9043fa866b958498.pdf
    • https://static.usrfiles.com/ugd/4b874d_926278a701b944019e2a7afa49c66ecd.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/kutamafagasasifomanuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/95773485406.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/42077079168.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7254/files/pathway_aterosklerosis.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_off00006682.bin
c29145b5e3e709252d92d8a795f4c97e0da55581b49ecb41819b446eeea88389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6682 5048 bytes
font_01_sfnt_off000077c9.bin
5c0c40fbd847ff66dfcab83dba4d62c5e7966b8ecf54654dbaca9654d741238a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 11176 bytes

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