Malicious PDF — malware analysis report

Static analysis result for SHA-256 5098ebec50b161c6…

MALICIOUS

PDF

37.2 KB Created: 2020-10-28 17:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c7a9bb5982e53201c8ef1d4182ce60b SHA-1: 11be48ecf49263c63c1057a8912c99229f925ab8 SHA-256: 5098ebec50b161c64f5f3b63775c40108047eec16a66d87058fc5bf4c9e6342c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a PDF, further supporting the redirection attack pattern.

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.me/123?keyword=windows+server+2012+r2+inside+out+pdf
    • https://rukutatonaneto.weebly.com/uploads/1/3/4/0/134012616/6d49f8a8fcee.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f875725d89a1.pdf
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f886c33a864b.pdf
    • https://jipemovikeral.weebly.com/uploads/1/3/4/0/134012889/dbd7244f15aa.pdf
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/ac9149829f3.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/zujazemikaxe.pdf
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8fafa627eea.pdf
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/f88eff9a.pdf
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f97840fea901.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8e39f420557.pdf
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5f90b75179165.pdf
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f97492c589aa.pdf
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/61d71de36d31b0.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/421601.pdf
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/d1ee3c84.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f8c8949669e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/munojopamigudixebuvafa.pdf
    • https://s3.amazonaws.com/henghuili-files/osteoarthritis_knee_exercises.pdf
    • https://s3.amazonaws.com/gelawiweza/adding_and_subtracting_mixed_numbers_worksheets_common_core.pdf
    • https://s3.amazonaws.com/limewub/tejexef.pdf
    • https://s3.amazonaws.com/bevarolimesale/dajezakogobovumuzivolajen.pdf
    • https://s3.amazonaws.com/waxapoz/jejugedegelod.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005363.bin
83f91e88a5d1aed71cb0b9510561bfbbef83bfd2df3a0fb8d023a1c10db577f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5363 5284 bytes
font_01_sfnt_off00006597.bin
1e9b0cb32103205309df62aac2896469d0fd6e74a1ddb7531ee33d158bf5630f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6597 9888 bytes

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