Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ab205a1ec25dce…

MALICIOUS

PDF

53.7 KB Created: 2020-08-18 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78e7b1c88b706e06949f9f9476c5ee68 SHA-1: 7ebf3df38114cfd51e601029e81f0a8abd3b4e36 SHA-256: e0ab205a1ec25dce9c5b1cd318320e3a37abb7da975872aef2753ea7e2095289
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, likely as part of an SEO link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to 'common core math worksheets' and the malicious URL, suggesting a lure to trick users into clicking the malicious link.

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=common+core+math+worksheets+6th+grade+answers
    • http://files.lashthetics.shop/uploads/1/3/0/8/130814666/5dc60fe9610d.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/akbar_birbal_kahani_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/effects_of_inflation.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/98246934756.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/tasajelopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/kepubun.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/wazafirubonatosit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/jopimibisowijafibib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/70289495538.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/1671968012.pdf
    • https://cdn.shopify.com/s/files/1/0456/4857/6679/files/geninajokuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/kufazavalivasonurugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/43125226791.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_off0000943e.bin
5101e1624a99e192ae0bcd3eea0bb51b4e8f630796707c321c7ed33b8f1855aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x943E 5536 bytes
font_01_sfnt_off0000a6ed.bin
045075f8681bf3cba8b55b83d1e5ea23a482e2b7dcc29487c8edbc41faa735b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6ED 10236 bytes

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