Malicious PDF — malware analysis report

Static analysis result for SHA-256 2856d7543c4b8283…

MALICIOUS

PDF

62.0 KB Created: 2020-09-30 03:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da20f34f873c2fa0afc5bc998226ec4b SHA-1: c07d14f939a105183f1db85c6962211bbf2da76d SHA-256: 2856d7543c4b828360cff4b0dfb47233fa5e11fec24cc4a6457aaf23e6d1eab8
92 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://gettraff.ru/strik?keyword=alexei+shirov+pdf'. This indicates the document is designed to lure users to a potentially malicious website. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/strik?keyword=alexei+shirov+pdf
    • http://files.iuaonly.com/uploads/1/3/1/6/131636677/gapubusepilenoxa.pdf
    • http://files.cesvac.com/uploads/1/3/1/8/131871919/jixurozaxeragisa.pdf
    • http://tilokimaj.loudandclearcopy.com/uploads/1/3/2/6/132681300/bakupebusegiloxuvoke.pdf
    • http://files.michelle4edu.com/uploads/1/3/1/6/131606489/8d923919.pdf
    • https://site-1036646.mozfiles.com/files/1036646/32386623709.pdf
    • https://site-1037082.mozfiles.com/files/1037082/nemulunijugele.pdf
    • https://site-1037228.mozfiles.com/files/1037228/guxetokini.pdf
    • https://site-1036993.mozfiles.com/files/1036993/9134945586.pdf
    • https://site-1036826.mozfiles.com/files/1036826/43255211540.pdf
    • https://site-1037890.mozfiles.com/files/1037890/botibujavafo.pdf
    • https://site-1037267.mozfiles.com/files/1037267/tixesiseluraxesezibifana.pdf
    • https://site-1036985.mozfiles.com/files/1036985/50408182449.pdf
    • https://site-1036911.mozfiles.com/files/1036911/77196485206.pdf
    • https://site-1037849.mozfiles.com/files/1037849/49231290707.pdf
    • https://site-1036880.mozfiles.com/files/1036880/laxosutugojiponifiket.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_off0000a9b8.bin
36c3e7f282a7c8ceae9dc4d9963ac56837118691ada0c5702e4d8daa0467eda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B8 5036 bytes
font_01_sfnt_off0000bad8.bin
5d139c86ab3b70516fe58b63c172331e16661c0cb5e963f50f3cdfad3c8631de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 2248 bytes
font_02_sfnt_off0000c52d.bin
0c137709f0e27ce85606f0a1fb423b465dda2d39742666fcdf110e660502d8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 10980 bytes

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