Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9286ce174faed72…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 05:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f0ca193ed759d4b47a49cd405d5fbc SHA-1: 19b540511403dd214fd6d97f23256293ea7dd571 SHA-256: a9286ce174faed7249463d82e63c2d2fb264e15bac292b5912c6f2d1450804f6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to manipulate search engine results, with one critical link pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=circuito+de+la+comunicacion+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=circuito+de+la+comunicacion+pdf
    • http://files.wccperk.org/uploads/1/3/1/4/131483184/9504171.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6212/files/hairy_maclary_story.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/dawimomajegufexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/air_pollution_control.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/dasonuretapusesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/87499846898.pdf
    • https://cdn.shopify.com/s/files/1/0451/8101/0071/files/27144301534.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/segatop.pdf
    • https://cdn.shopify.com/s/files/1/0451/1003/4597/files/20007548415.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/tractor_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0434/8130/1158/files/cfmoto_zforce_800_trail_service_manual.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_off00005946.bin
739433a85ddf11c5b1950d36fac322e46ec0043a587a6dcb5d2b9fcd0fa08d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5946 5028 bytes
font_01_sfnt_off00006a3f.bin
673459d2595d94ce2a676fe8b6aa8eb1ae9080425ee73522075fb29ba84677f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3F 10572 bytes
font_02_sfnt_off00008c72.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C72 4324 bytes

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