Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8810d3d29c96e04…

MALICIOUS

PDF

45.7 KB Created: 2020-08-31 08:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebec91cc8d77b502de3cf07fb422f0fd SHA-1: e0f4f277d16d04d8e68ec4d490f68840ec9d3c02 SHA-256: e8810d3d29c96e0485c95d92e3a041218b2f9464a668e15d21f23b0b9ffecbf6
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The primary malicious IOC is the URL 'https://ttraff.cc/wix?keyword=reiki+symbols+in+tamil', which is likely used to direct users to a harmful destination. The document body, though heavily corrupted, also contains this URL, reinforcing its presence within the file's content.

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/wix?keyword=reiki+symbols+in+tamil
    • https://static.usrfiles.com/ugd/07625c_07b8840a5b554beb9a5381f2ddf24130.pdf
    • https://static.usrfiles.com/ugd/24853a_739b28398656466e8bad7f7640044952.pdf
    • https://static.usrfiles.com/ugd/c1de29_20cf536557934713acdda9581238b976.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/advanced_language_practice_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/book_of_thoth.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/neo_marxist_dependency_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/22995354462.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/18488403665.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/belifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1668/2663/files/87156327691.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/lowrance_elite_5_user_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d51.bin
ded1793a8adb2082c93930e543ffac3569cc1199084540d1634314f160641ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D51 5048 bytes
font_01_sfnt_off00006e6d.bin
791409b747cc1a7fd5c263118d42ccc1a0b9aed34700351a1274ef4cc6a06423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 2308 bytes
font_02_sfnt_off00007891.bin
588111bade741f400b032c2a4a7fee56b69ae81f1a8635d4ea435b3e23b894b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10076 bytes
font_03_sfnt_off00009b00.bin
e6f5ba150f71d955d173293bbaad0c3de5ce2644afc0fec054f3062ff30d8061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B00 6068 bytes

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