Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf634e224f8aa6…

MALICIOUS

PDF

35.7 KB Created: 2020-08-30 07:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d0ee268ac05c9aca6b9be235f4377e SHA-1: 55ae5f176b50b48c09f6650bbea1670bbf64ec58 SHA-256: f5bf634e224f8aa6a6de20e54a58a1b70c1b41df3ad167623d87d25fb1942489
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The redirector URL is 'https://ttraff.ru/wix?keyword=ebony+porn+pornhub', which likely serves as a lure. The document also contains a link farm of 16 PDF links, with the first being 'https://static.usrfiles.com/ugd/b8c837_a7dd1623cdc14e0389253627334ffbe6.pdf'. The primary attack pattern appears to be directing users to potentially harmful content or further 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=ebony+porn+pornhub
    • https://static.usrfiles.com/ugd/b8c837_a7dd1623cdc14e0389253627334ffbe6.pdf
    • https://static.usrfiles.com/ugd/784815_8e81f3ee911b40ebbbd53ee1dc1bd90d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8d5142e7c894a51bdee1eaed8d5c0eb.pdf
    • https://static.usrfiles.com/ugd/12f4eb_fa00596359b343f4bc4510d00d8b2e50.pdf
    • https://static.usrfiles.com/ugd/b8c837_0df5ff7df7c4421ba383340a86a07218.pdf
    • https://static.usrfiles.com/ugd/221f3a_df47543cdf774d61b0ce459477cfb6fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6e631406a947208f6286d43a2ee115.pdf
    • https://static.usrfiles.com/ugd/63d3ad_f0c995b1cf4448a29407014868cee7e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3aca774244f46878a595c64f546398c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbc05465ae0a4ac48cead0826860b0c9.pdf
    • https://static.usrfiles.com/ugd/b48b60_2840dcff8d6a4ee0ad36c18ce839acfd.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/tracteur_ford_4610_revue_technique.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/niragezoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/1936542780.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/articulate_storyline_tutorials_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/air_conditioner_maintenance_checklist.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_off00004747.bin
4584906fe5df799efde35e5ff096330a3b2db2d3fa4f919589df9752f1ecc772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4747 4320 bytes
font_01_sfnt_off000055c9.bin
45991887fcf6469c026d9aa57fc61370c4755987bad8c61b737c02668891ebe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C9 8952 bytes
font_02_sfnt_off00007447.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 4324 bytes

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