Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e2a2b5d720fa9d…

MALICIOUS

PDF

41.7 KB Created: 2020-08-21 12:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a128e975f17f8930e90360c770fb322 SHA-1: 9dfd0fdda5f7b2c9286e73e4927634d58faef71b SHA-256: e9e2a2b5d720fa9daa882f6c4e6c301fb371e7b36eeaf2491092ac89655a1266
152 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm, with many links pointing to PDF files hosted on Shopify. One prominent link, "https://ttraff.cc/pify?keyword=battery+bar++for+pc", acts as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other PDF files, suggesting a lure to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=battery+bar++for+pc
    • http://wusugopes.pasdedeuxdance.com/uploads/1/3/2/6/132681268/tejodobu.pdf
    • http://files.areallivemom.com/uploads/1/3/1/8/131856071/viwuxazelu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/gokixuwufemanatevirame.pdf
    • https://cdn.shopify.com/s/files/1/0432/2200/7969/files/91924032696.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/fozepinutabid.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2199/files/92582987225.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/81245035560.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/8643380259.pdf
    • https://cdn.shopify.com/s/files/1/0457/6405/1100/files/46754720353.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/62672263979.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/lagoto.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_off000064b9.bin
9d077740c533b8d85fae7f00976e4ccf19c5c90584fbf968252d1be0080d1c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 5088 bytes
font_01_sfnt_off00007625.bin
59b07741b3a0e02e62b35df286cd03d15eead086421fbd77acd56479f0741fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7625 10668 bytes

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