Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf6a98e068a485c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-31 17:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d26b7f435034ad1900cadf8ab8fc378 SHA-1: 4b93f8ccedaf5b2ee990b15759c76f1af875812b SHA-256: 2bf6a98e068a485c2405338d93b9c7bf1a0ba597976489c8e18070af6a651f38
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains references to 'Google developer android p' and the malicious URL 'https://ttraff.cc/wix?keyword=google+developer+android+p'. This suggests a social engineering attack aiming to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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=google+developer+android+p
    • https://static.usrfiles.com/ugd/bdeb4c_fb16110a2a2f494394580c8e5b3636d1.pdf
    • https://static.usrfiles.com/ugd/c20ea7_282a8d90d734454b8d473e4435529bf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d8a4bc43a6140498cef211b3bd3bf4d.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6080c5272dd5473eb24d9cc1213272e3.pdf
    • https://static.usrfiles.com/ugd/cc15ef_e7972f78669e4f7890b861a51f0f6992.pdf
    • https://static.usrfiles.com/ugd/2ca09c_91bba5f8167a4d00937d4a571e4f87de.pdf
    • https://static.usrfiles.com/ugd/221f3a_3c1391c9c27a4f398c862550f6309ce8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6b7d4e6566648ff8d62b88f85dfd127.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a705fc8c45247af96f67a23a6bb725b.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_3bf028229120494f8cbf073a85b6c29b.pdf
    • https://static.usrfiles.com/ugd/a48928_d1200380486e4a118755b013f51f4155.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6107023b70e4a7ea57c0ffb23a090bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c3ccf94e199499b9bd50393b5a930bd.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_0d9d6041042646a2a1c64b61e6f07941.pdf
    • https://static.usrfiles.com/ugd/ae059d_bf09221ac16d45e59fe65c814d717197.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_off00005e5a.bin
fd3c8c96d75ed6d99317e152131a51599bb9aa601236ae2fcb8ed2e9b59055c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5040 bytes
font_01_sfnt_off00006f9b.bin
ba39c8223df4f970b8cb4dfe7e9eb53504f44c5958ac40a953715e1313eb48e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 10556 bytes
font_02_sfnt_off000093e6.bin
6b9d2848769c25b885fbe95c4dbc4e40a3feb47a8fbafd1b09b0f8fc0c0b7be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E6 17880 bytes

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