Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc88c26c5487cd0…

MALICIOUS

PDF

36.6 KB Created: 2020-08-29 03:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af82e1834c226f68641d65562c4dabb9 SHA-1: c199577b1247aab0defd1b7f4f9050dd0b4ef35e SHA-256: adc88c26c5487cd0be0575d5b5d7d99a9be9a7fb83434fdf146a1d4b57f9e2d7
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=quimica+analitica+cualitativa+pdf'. The document body, though heavily obfuscated, contains the same keyword and URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=quimica+analitica+cualitativa+pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbd7408486747099e70b2d12ebee26c.pdf
    • https://static.usrfiles.com/ugd/b8c837_23aa52622ae04cd6862ec580406df94f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0966f76519d5435fb58d3384d9b6cfcb.pdf
    • https://cdn.shopify.com/s/files/1/0440/5015/3622/files/29524257733.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9845/files/zuzodonudugasalajux.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/nulajaweretesobidetege.pdf
    • https://cdn.shopify.com/s/files/1/0437/1005/4554/files/80771840248.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/rewakudaravuxenu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7562/3320/files/rebobofadiwafij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/berg_balance_scale_7_item_short_form_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/kepuxobele.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e8dc1c3d41843349c66fd4d5ca0aa5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_39557059412d42bda1aebf6696bb70ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fe0897ff2f64916b54355b6c46ce2c9.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_off000050d6.bin
d5bb80c438d2c5ad7794bc1ea96bd89a4aa0d9f87f445ac83768e668f3e5b327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D6 5148 bytes
font_01_sfnt_off00006250.bin
2384b6bb0614b1f67dda7053a3a1491bcf9f3ff5569403e9598084bf4f2f0b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 10376 bytes

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