Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3c8b813a5518c4…

MALICIOUS

PDF

55.0 KB Created: 2020-11-06 14:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bd9059eab46ebdd34abefaf12010bf SHA-1: 54b380bf63fc7f129740411fcd01cd6ab6b8eb95 SHA-256: ab3c8b813a5518c4fc238e3704d08dea6a5f219b28a1b9638fb6ddb2f9c8538f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://traffmen.ru/123?keyword=citizens+cable+tv+guide', suggesting a lure to external malicious content. The ML classifier also strongly indicated maliciousness.

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://traffmen.ru/123?keyword=citizens+cable+tv+guide
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f90d2af2bea9.pdf
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f9927b571af7.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87b06f4a1e2.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5f9e2dde41632.pdf
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fa4d943b64f4.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f8cf30125fae.pdf
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/favaxumefe.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/vajomepidibaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8a8a2b1936f.pdf
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5fa4a7212b8d8.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5f96652239f1d.pdf
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f92a2226a510.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8deffdcf7fa.pdf
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f8dba0f1a20a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/942758df-2b62-4444-9e56-bcc6724c1fd5/6209284001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063fa.bin
6de0b0cfe9ae8b845ef312a701f4a0a2b42778957ad0e2230165bef679022a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 17036 bytes
font_01_sfnt_off000096ce.bin
3f36b75504c33d5b092e3d677ce31ee8eb270fdd58bf9dcaaf78efab60ad6561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CE 5168 bytes
font_02_sfnt_off0000a87e.bin
d6ad33f920e7ec757ab76b5fcd44de1bbebecdd403d87c2ebcc2f8cb9c9f252a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87E 11132 bytes

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