Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6514ae65f8199e…

MALICIOUS

PDF

38.3 KB Created: 2020-08-23 00:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9048c0573cacd7d248a980c2cb178e SHA-1: 9064718f6f00cb37faf26f43c81fd137f6365c5f SHA-256: ca6514ae65f8199e7676e1e19368b3971cb0999a864f8fe4d626d203f9f9986a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=amigos+para+siempre+piano+pdf', which is likely used to redirect users to malicious content. The presence of numerous Shopify-hosted PDF links suggests a link farm for SEO manipulation or to host further malicious 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/pify?keyword=amigos+para+siempre+piano+pdf
    • http://files.marlenemontoya.com/uploads/1/3/1/4/131453432/1778666.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • http://nexijiw.lab-dentalevolution.com/uploads/1/3/0/7/130775493/2298017.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/kukukop.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/watobunekunebibilisiwiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/68595521425.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/62022364710.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/zesogasipelazewaberewubax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/b._sc_chemistry_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/nalen.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/advanced_apex_programming_for_salesforce._com_and_force._com.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/piwola.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/performance_bike_redondo_beach.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4246/files/navigation_bar_application.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/bogud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046c0.bin
24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C0 6588 bytes
font_01_sfnt_off0000573a.bin
e98302bd17172db0cec7ef92e68f6b477230f149c3f41ad1b40a8425e495f085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 5320 bytes
font_02_sfnt_off00006936.bin
1d4da24a79d2152e89e2deddb0a0d72d7d6a842d2b339bda99c13006ece63336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 10124 bytes

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