Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa63b21bc1620d0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31829d48909b9075c351d964af5070c4 SHA-1: 5ec141210f49ad8fd5688ec9e26ec09adcf52a95 SHA-256: dfa63b21bc1620d0bab58ca78c7534dd4e06b0cbeb1f3f0addae368a77991b9c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=grive.net+migration+becasse'. Additionally, a large number of links to external PDFs hosted on cdn.shopify.com were detected, suggesting a potential link farm or distribution mechanism. The ML classifier also flagged this PDF with high confidence.

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.com/wix?keyword=grive.net+migration+becasse
    • https://cdn.shopify.com/s/files/1/0448/9094/7739/files/agudas_palabras.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/lekusotot.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/24258749934.pdf
    • https://cdn.shopify.com/s/files/1/0457/8974/1222/files/sebi_guidelines_in_primary_market.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/fundamentals_of_c_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0437/2519/3368/files/punibiladularufirulaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/xezowadefevupopak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/devipakum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://static.usrfiles.com/ugd/8de238_aab158430ffc43cb9d586bdd6f95a2fc.pdf
    • https://static.usrfiles.com/ugd/83d902_25c0d435830a45f3b344f82bb3b66109.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c61683f92c448ffbc5ad1544175c248.pdf
    • https://static.usrfiles.com/ugd/cf14a4_2c50364b84d846928ce964654b41afba.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_off0000595b.bin
4efce47a40d737ed9b9c76b025d243e7b2b9a5611e35ed00861cd5fcaad95993
pdf-font-stream PDF embedded font (sfnt) at offset 0x595B 5348 bytes
font_01_sfnt_off00006b82.bin
6dd05b7d7a0f036a3954d15c283998acfc8d38a77bed7e3a6d8735cad8c028aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 9980 bytes