Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13c37705f6d2a5c…

MALICIOUS

PDF

40.0 KB Created: 2020-08-18 13:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94d6220da5b605fc383d6135a2c08d8 SHA-1: 3dd97aa2a7d8c4ecf7c06989f0ff1206e9ac660b SHA-256: e13c37705f6d2a5cb84acd7a974dd7abf100d3d0e33ce4bd9daa55f660499e83
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, also contains this URL. The presence of a link farm and the ML classifier's high confidence score suggest a malicious intent, likely to lure users to a harmful site. No scripts were extracted, limiting the analysis of specific execution techniques.

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.ru/pify?keyword=exec+level+reporting
    • http://budujuri.suzukiviolinschool.com/uploads/1/3/0/9/130969742/najelafamizase.pdf
    • http://fijaso.oakstreetart.com/uploads/1/3/1/4/131410685/kiwikoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2996/8534/files/55949001316.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/split_merged_files.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/kemiderebato.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/digital_marketing_ebooks_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/50046595334.pdf
    • https://cdn.shopify.com/s/files/1/0444/3491/5495/files/msi_afterburner_free_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/57697797899.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_off00005f73.bin
4c846350b7079b8c7ea3b6c1472e1fbf1b995036063856418d5630a8abb978c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 4796 bytes
font_01_sfnt_off00006fe5.bin
ce9eeb4f42604d9d7ff94b3888c293c7528676f0d194b8451207e4ca6cab5069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 10596 bytes

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