Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea51416230588f3…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 08:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140fe061ba34ce9e364a29e44d406c9e SHA-1: c23563df5c17361ea3a2122f859e32bae7f0f9f1 SHA-256: 7ea51416230588f33ca3a651bd7b4e65ef3b37396cb48eeaf31ec848b891ca61
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=equivalent+expressions+worksheet+7th+grade+pdf'. Additional heuristics indicate a PDF link farm, suggesting an attempt to manipulate search engine results or distribute links broadly. The document body, though heavily obfuscated, contains the same redirector URL and references 'wkhtmltopdf', indicating it was likely generated by a tool for creating PDFs from web content. The primary intent appears to be directing users to the malicious 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.ru/pify?keyword=equivalent+expressions+worksheet+7th+grade+pdf
    • http://files.rubycopper.vn/uploads/1/3/1/6/131606155/6564262.pdf
    • http://files.dinarchronicles.com/uploads/1/3/0/9/130969987/82eefe5c8f.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://files.kimashleyphotos.com/uploads/1/3/0/7/130740049/2426222.pdf
    • http://kabid.storyscouts.org/uploads/1/3/2/8/132816066/puxagovogug-jajebisamu-xemimij-zefupajabi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/23695799249.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/vewonomeborefagosubitos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/renasikurixirixuverapur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/fununavilumawapugamexo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/50652705807.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/andhra_pradesh_history_in_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/pojidosufegabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/12879214377.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/26730444281.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/97542976229.pdf
    • https://cdn.shopify.com/s/files/1/0432/0372/3428/files/89385762022.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_off00005504.bin
f889273a7bc280b251c910a8c9f7f43aee5331b8dc591d911c1661014bbda395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5504 5632 bytes
font_01_sfnt_off00006842.bin
14154bd7c9ad503f847b6e7cfedf3e4e0a4c5b553bc1ed97c02e5cfc25327636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 9864 bytes
font_02_sfnt_off00008a0c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 4324 bytes

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