Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c64dd33b1185af5…

MALICIOUS

PDF

43.2 KB Created: 2020-09-18 14:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc11d3da5133b0c9474a91159751bc6 SHA-1: 4cd54da1d0c665762a5ab163ec2f926b553c8d90 SHA-256: 2c64dd33b1185af5d6b7405dc8a44a9e218eb42b6ad0f0c96dc8df8f94682b96
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a keyword related to 'six guns apk old version'. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to potentially malicious PDF files hosted on various domains. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.link/wix?keyword=six+guns+apk+old+version
    • http://gaviliso.colganscattle.com/uploads/1/3/2/8/132814930/0cb19c8f8c.pdf
    • http://kewiful.surgetonewlevels.net/uploads/1/3/2/7/132740228/f282ab64426ec7.pdf
    • http://dijezas.anew1.net/uploads/1/3/1/4/131453541/gibajiveru.pdf
    • http://kemuwub.jenkatz-buonincontro.com/uploads/1/3/1/1/131164250/banulaxe_xejasubo_jujiram_dexem.pdf
    • https://b39e5737-8e99-430e-ba67-fc38b3299427.filesusr.com/ugd/8c7d07_456c12ae4d8a4f37b3399c9798fbd174.pdf?index=true
    • https://70dd346d-9bf3-4ddc-bda5-10065a5e006d.filesusr.com/ugd/fd30ac_becf83c972904346b59495bcc884f913.pdf?index=true
    • https://85424044-d622-498e-a43b-f7cab8034a80.filesusr.com/ugd/89064d_c8907618bc29488bb338a612d6dece99.pdf?index=true
    • https://a1386ae6-676b-4b54-8615-4801022d2912.filesusr.com/ugd/031dda_3013bee757d54b68be1e558072405a8c.pdf?index=true
    • https://6ac1c19d-a6c9-427f-a74b-d7af80211ca6.filesusr.com/ugd/067ecb_32902a938518492d8a5f5ce001a48094.pdf?index=true
    • https://1f9d4c0e-318e-43dd-8a17-e631f1aff196.filesusr.com/ugd/2d797c_099c2073c6b2435b97e3e9d16478981d.pdf?index=true
    • https://ac354a8e-aa0c-4f81-a8b5-d67babfe0155.filesusr.com/ugd/3c2e2e_0b11ff9304ec4142be607fc9d89f24a0.pdf?index=true
    • https://acf72364-b165-4bbb-ba55-673ae34a7ec0.filesusr.com/ugd/417718_8990fc740a8e4e1c8206756d42cf1846.pdf?index=true
    • https://dd0b98c4-3225-4410-a87e-294f987f8b13.filesusr.com/ugd/f17c08_200bc11e394f4c41a24d76a7a6e4e27d.pdf?index=true
    • https://0bddbe57-6d6c-4d4b-a501-4336602403f1.filesusr.com/ugd/4bb894_3113bdc3907d4cbfb10940527ed7ee74.pdf?index=true
    • 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_off000069f9.bin
2a016d5d8fcb9f01a630e02e38ce6fa36d5609c9b071d7b2baa6b05e03ad3cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F9 5424 bytes
font_01_sfnt_off00007c89.bin
f8fff906a24a34a70d7010aa8f30b977fc93412bfbe063f5728c2937ff812419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C89 10404 bytes

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