Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9faee3bfbce215…

MALICIOUS

PDF

38.1 KB Created: 2020-10-29 22:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5ff2aaaf4a091ea30cce029a19c9342b SHA-1: 17f2ffdc27aa59d990bbac2c13091165d7ba0c06 SHA-256: fb9faee3bfbce215d5d4d50ad4f59381326f49d3c9e1493632462f9bf66fd30f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/123?keyword=kmz+file+reader+download, is flagged as a known malicious redirector. The document body text, though heavily obfuscated, contains keywords related to downloads and the malicious URL, suggesting a lure to trick users into downloading a payload. 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://cctraff.ru/123?keyword=kmz+file+reader+download In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4878/3009/files/78241273019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e5590a-8784-411e-bc60-c1ecd0c039cc/3470978567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f99c7d7-b217-417e-8e78-af3ea814f9dd/29951620262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c996f09-faad-4624-b31b-79977757ab4a/xaridigajememovoxureju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743bc2a3-5147-4607-9f0e-f583c3c80aef/sebegodosivop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1d40fa-80bf-404e-997e-15d1e888cb4b/54928014810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d209874-823b-4a6e-af4c-00f5d493e1f5/35798753672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69c7d13-349b-47d2-b392-3f8168542f98/lojulasiravirijebezitiwid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024e83a0-0bc2-45f4-8219-765a3103e4c0/puwivelulasuveki.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/alpha_male_max_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/gudamipuvuvifefikilixara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b356ba76-5549-466e-a887-e63ce24b18c9/fonomopep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9bdd94-55ef-4c44-9b8d-6e9a8b153897/5833721039.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A12 4692 bytes
SHA-256: edd705d56ef965082a999d668621130f4e625093dfcc95cd5b9d8fcf423da97d
font_01_sfnt_off000059f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F7 10520 bytes
SHA-256: 3a31f3c55a3b06e899298e8e51b5ce85d636f0d424c3529fa653fe88a79fe8c8
font_02_sfnt_off00007dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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