Malicious PDF — malware analysis report

Static analysis result for SHA-256 909c8572b04f3a2b…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e0f01f069a4ac919e47550e894f7573 SHA-1: 7126826c3f8e77019963f4c51836cfd54a8c10bb SHA-256: 909c8572b04f3a2b595dfc76f9a95b05bace8b550e53b47f5fa7cbb796da9e7d
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a malicious redirector to 'ttraff.com'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=niveles+de+prevencion
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/82617996875.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/internal_carotid_artery_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jomupuweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/adicionar_assinatura_digital.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/72697251113.pdf
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/mepumopawonosadarutomo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/acta_constitutiva_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/62757490459.pdf
    • https://static.usrfiles.com/ugd/625844_6a737acd360f4e44bb74318788c3ba47.pdf
    • https://static.usrfiles.com/ugd/5ecadc_e64daf29f8a84c2aa7899cd347d05472.pdf
    • https://static.usrfiles.com/ugd/b8c837_db74ee35a5e246d69909103f5f0c5f7d.pdf
    • https://static.usrfiles.com/ugd/5b9a87_2d99ed884e0f47d78bd2faf49a47d937.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_off0000640a.bin
36109c044ebec62da8c733ee85e99484d47a40ab836339d6089f4fa81d67f95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 4884 bytes
font_01_sfnt_off000074bb.bin
7dfc1d4d7f382f5a3fb50e2e0e868e4c219eb3ded9df6975a444e697434eeaa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BB 10972 bytes

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