Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e79f8c0b5cba1cb…

MALICIOUS

PDF

45.3 KB Created: 2020-08-17 05:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd007189f28b1941fa2de694e5a443e SHA-1: e60a771a4994cbf6ec9029185dbc865a9ff684bc SHA-256: 9e79f8c0b5cba1cbd778beb3db37a8459d5f5eaf5b5b787991b7008c706a7ded
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.cc. The document body, though heavily obfuscated, contains the same URL and a document title suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious infrastructure via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=factoring+completely+worksheet+doc
    • http://files.becomingsarh.com/uploads/1/3/0/8/130813841/zuvobotivuvewepo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/venagizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/13027652041.pdf
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/rate_confirmation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/26949565507.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/dusogol.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/99467935962.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/aicpa_audit_guide_audit_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/android_studio_developer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1448/0287/files/lugopeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/6916/8021/files/39725356840.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_off00006502.bin
41bfd0b2449e46d26ffcebc4951232f0cfc452911b1093d1a853fb5b76780929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6502 5488 bytes
font_01_sfnt_off00007793.bin
a961aad11be4aa48b2ec5c6838b019849b47bcd9bef1c7c56af09936d92b308b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7793 10192 bytes
font_02_sfnt_off00009a78.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A78 4324 bytes

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