Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffda478fd1a5939…

MALICIOUS

PDF

44.6 KB Created: 2020-10-04 02:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d3eabb70d105d106a238f54764492b SHA-1: 5d534dfa1e599b38fc5e66a3bb6c777234660b47 SHA-256: 8ffda478fd1a5939cd397efe1f7b5ce6e3f7d96d620afc17337da41b7ed48b24
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://gettraff.ru/strik?keyword=ffx+bribe+list', and a large number of embedded links to external PDFs, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. The document body contains a mix of what appears to be metadata and the malicious URL, suggesting a lure.

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://gettraff.ru/strik?keyword=ffx+bribe+list
    • http://files.dandjgypcrete.com/uploads/1/3/1/3/131397940/6375550.pdf
    • http://files.guillome.nl/uploads/1/3/2/6/132696512/472ae.pdf
    • http://files.threadwood.com/uploads/1/3/0/7/130776177/9708020.pdf
    • http://files.ivanajewellery.com/uploads/1/3/1/3/131380504/5270569.pdf
    • http://foraga.stephencoetzee.co.uk/uploads/1/3/1/6/131607712/9d1333.pdf
    • https://site-1042658.mozfiles.com/files/1042658/48209421117.pdf
    • https://site-1036885.mozfiles.com/files/1036885/toxorulozenuzavowim.pdf
    • https://site-1038422.mozfiles.com/files/1038422/51645499149.pdf
    • https://site-1042624.mozfiles.com/files/1042624/33691059427.pdf
    • https://site-1037276.mozfiles.com/files/1037276/zugigulinavudirero.pdf
    • https://site-1036733.mozfiles.com/files/1036733/guzisorovapupopegos.pdf
    • https://site-1040663.mozfiles.com/files/1040663/45992059068.pdf
    • https://site-1036627.mozfiles.com/files/1036627/kurawapatodokowuwapafim.pdf
    • http://files.threadwood.com/uplo
    • https://uploads.strikinglycdn.com/files/96a5b638-836b-48c6-aeda-b6048534eb2e/49545492604.pdf
    • https://uploads.strikinglycdn.com/files/fad8c2e9-46a7-4bcf-9716-71d48f89a158/berojilimifolasa.pdf
    • https://uploads.strikinglycdn.com/files/9dbdb02b-5a99-4eb4-b517-63765c49a29b/loturebiwagixevibobujed.pdf
    • https://uploads.strikinglycdn.com/files/081ef93f-6a53-4dea-8dd6-4d7027e38671/laxenonaxuwutetepurewoj.pdf
    • https://uploads.strikinglycdn.com/files/ff4f2a50-eab8-4ea8-94a0-00fc7a939986/xigiponizopovologove.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676a.bin
3dbd936a7fda99046477418181bc4b1286994301b46f6e21997ececde05af2bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676A 4716 bytes
font_01_sfnt_off0000778d.bin
57d8c3f0890bf571f21bd27a50d6408a8646734b2e7df75654adea2d102504f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 14720 bytes

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