Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7575fa6573093c…

MALICIOUS

PDF

34.6 KB Created: 2020-08-23 23:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3aac0926ecee50d09bc0188172f67e4 SHA-1: c4867107d5e0bd88ead96dad3e3e838adba61499 SHA-256: 1a7575fa6573093cbccd5f6ed54222e1eff5f70f86dfa3c510757e7784343790
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Business plus 2 cambridge pdf'. The presence of a link farm and a malicious redirector suggests an attempt to direct users to harmful content or initiate a download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=business+plus+2+cambridge+pdf
    • http://novaxak.sunsethoa.com/uploads/1/3/0/7/130740596/dawug.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/pogovuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/38905545205.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/48346755412.pdf
    • https://cdn.shopify.com/s/files/1/0447/0826/6137/files/binomial_squared_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0421/3917/files/kejet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9364/6753/files/wesajanapudubivegixuker.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/xujuno.pdf
    • https://cdn.shopify.com/s/files/1/0463/2608/7841/files/29997287077.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/45745884927.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/89546214706.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_off00004917.bin
192cd2440809ebda2b24906ba3827c94c07787ad672bc2b8ca6f326186f4878f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4917 5796 bytes
font_01_sfnt_off00005cb0.bin
a47f5a1012a144bdcae2eb13bdbfadffe86f622823b2cce283efae457245dcb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB0 9784 bytes

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