Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4e693b0ade6540…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4aa9a72c6dbb2bdf6b7473566be454e SHA-1: a0ed850758258d104160416b97a3ae91daf3e004 SHA-256: 3e4e693b0ade6540fe66dceec10ff590625f4e1f42b25888a9166c6a1922690a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to these URLs, suggesting a link farm or redirection strategy to deliver malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • 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.
  • 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.cc/pify?keyword=w3schools+bootstrap+form
    • http://files.evelynpatriciaterry.com/uploads/1/3/1/3/131379395/6970682.pdf
    • http://sajega.asaanalytics.com/uploads/1/3/2/7/132710714/5490968.pdf
    • http://nogazizik.photographybyshannonrae.com/uploads/1/3/1/4/131437145/e23f00.pdf
    • http://files.thepatternedpaperplate.com/uploads/1/3/1/3/131379949/80f867ad60113ed.pdf
    • https://cdn.shopify.com/s/files/1/0431/2003/3943/files/test_bocconi_magistrale.pdf
    • https://cdn.shopify.com/s/files/1/0436/6296/6937/files/mivapatuxuwusibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5402/files/biriwusotisokif.pdf
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/rifts_book_of_magic.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/exercises_active_and_passive_voice.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/bisukizasibusokeganifu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5445/7254/files/54348633414.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/31524748242.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_off00005de9.bin
a95344cc49688c6b84b540de0f37722d656c954565271d28354f50868c6bca71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 5572 bytes
font_01_sfnt_off000070ba.bin
293b2b25157d9b3c29027ba561ebde61fccc9e4b35503b2629f03bc402df3f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BA 14812 bytes

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