Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea230d145dfd61f9…

MALICIOUS

PDF

58.7 KB Created: 2020-07-30 20:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc95ae7c05f9940ba8b1761e48e1ca56 SHA-1: f853d798418ee60e9073f0449ab6c7f66e0570f2 SHA-256: ea230d145dfd61f9a730c3e25a89c7c91170de8f184a41a159f842605830f043
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=que+es+calidad+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of a malicious redirector and a link farm suggests an attempt to drive traffic to potentially harmful sites.

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=que+es+calidad+pdf
    • http://files.galvestonbaycharterfishing.com/uploads/1/3/1/3/131381480/jovalopurabelaje.pdf
    • http://files.ntnmgl.com/uploads/1/3/1/3/131380158/70fee16e7.pdf
    • http://files.tiered-educational-consulting.com/uploads/1/3/0/9/130969893/zurarozexanotijerax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/51323977028.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/zigavesajevojexebeduni.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/jizojaraziwemajatub.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/ponomuwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/vaxetitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/koviminumaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/renojisemamuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/25790472409.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_off0000a68c.bin
3eb2d03c039f0cedc968402c40111d37123a99ce7e9b8d8657a7496cd7e59345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA68C 4700 bytes
font_01_sfnt_off0000b68f.bin
0e84e3167ba537d332f9de1e353f2f6c2d73405e8ea72c3f83b124f2de74dc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 11740 bytes

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