Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8efcd048b2e70d…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 09:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d55b69dbc134a7c5629115e948f80b2 SHA-1: 577bf523111a74642f9ed6f87222c7c7a18e66f7 SHA-256: 9f8efcd048b2e70dd95c4b6a08ab4df5320fda58f47836b5b7f02aad6d6381ec
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a medical guide. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm used for SEO poisoning or to obscure the true destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious.

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.com/pify?keyword=guia+medico+unimed+araguaina+pdf
    • http://files.homeinspectoralbuquerque.com/uploads/1/3/2/3/132303117/97698afe0bfe27f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0452/2462/4288/files/vikewesekerelazamob.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/11040436203.pdf
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/anemia_sideroblastica_adquirida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/balifupanikiful.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/vupag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/79985437315.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/realidades_2_capitulo_2a-_6_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/83675075902.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_off00004bb7.bin
a35224b77afced7ea7961d9d17fb3ad02371d48704dba8c4fa27a7f0dcf7297a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB7 5296 bytes
font_01_sfnt_off00005dad.bin
81ff9e4c60692fd355c965decdb5966dd3d14827bc2ba77d57c3a67d62d1a1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAD 16312 bytes

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