Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6844f0de1bb7780…

MALICIOUS

PDF

52.5 KB Created: 2020-08-29 22:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de62793a7d4b265992ef6a7e0c642f57 SHA-1: 2fab902d500f146a85056d28caab9a62dc076ed5 SHA-256: b6844f0de1bb7780d6b0f82ec4ee922b66dacc94c06e739115d7e2d9df1a6808
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, with one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=historia+de+la+psicolog%25C3%25ADa+diferencial'. This indicates a likely attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL.

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=historia+de+la+psicolog%25C3%25ADa+diferencial
    • https://static.usrfiles.com/ugd/314c35_c4f639b9f76e48c6b0d6a096bd6c6fcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1578dece73340fc9d5ec14cd4dca690.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f7122a0f76846b5979b588cb5287a24.pdf
    • https://static.usrfiles.com/ugd/5b5da7_85cdecbfea844dd4a6af1e5835954ad6.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/kaxetufunemuwitib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/westlife_songs_nonstop_audio.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/autodwg_dwg_to_converter_full_version.pdf
    • https://static.usrfiles.com/ugd/5ed537_bc0b438ca63840adb765ecbf48e4f58d.pdf
    • https://static.usrfiles.com/ugd/906e9f_7bd9473ccbe642329ec7ecc0d53b934d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/0d2908_635968c9b6f741c28e15d3d2f554da36.pdf
    • https://static.usrfiles.com/ugd/b8c837_317531ea4ac14b2b8c4626ba3e60e69b.pdf
    • https://static.usrfiles.com/ugd/49be48_4104c658e44d4ef0a34d97b1e50b9738.pdf
    • https://static.usrfiles.com/ugd/b8c837_6266bfeccb6f4ed397cebcdb63f6a4ad.pdf
    • https://static.usrfiles.com/ugd/24853a_5441c3bb4e224354b044d031274f384c.pdf
    • https://static.usrfiles.com/ugd/9d869b_2d0b4cb879684605a35287b80b085c8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fd98ab8379b47ddb5271056b0ae102f.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_off00008af5.bin
f1f432a05ef3541b56076e17a999027ad958733773ea45e7737d4bf6d2ac2515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 5340 bytes
font_01_sfnt_off00009d29.bin
4a27c64f9a7ef0810842dae59177a4e59bcb16df28332e03176f2082ca9ea581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D29 11420 bytes

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