Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4ef9d68939eb9e…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 13:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eda76beb3ca485757b0250a5913aeea SHA-1: d1e08f823dc31255b05ed7d04a030ee6b2a2e1c0 SHA-256: 4d4ef9d68939eb9edc858ca05cab00debae95eb86327396aed06d0422c8b2e9d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to academic topics and the URL 'https://ttraff.ru/pify?keyword=applications+of+computer+in+microbiology+pdf', suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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=applications+of+computer+in+microbiology+pdf
    • http://files.onpointsharp.com/uploads/1/3/1/0/131070151/faxasugamu.pdf
    • http://files.innerheartpathways.com/uploads/1/3/2/6/132681002/46e9335.pdf
    • http://tevib.summitrootsfarm.co/uploads/1/3/1/0/131069899/4dfce3860a.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6863/files/46226247454.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/fupalupasub.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/panorijasudulasoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/ruvovulakap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/68668214918.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/1281230615.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/96025194049.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/86865406874.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/convert_file_to_word_online_without_email.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0433/9502/3013/files/although_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/sutiwoxasuteseteviliti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/9423173745.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/pull_up_wiz_khalifa_download.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_off00006a38.bin
5776cf1c7f7c291886bbaf27a8d1df5e549368da06808ed11b07501780aa6546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A38 5708 bytes
font_01_sfnt_off00007d91.bin
8987edfef6cef83a65dfe88bd327844876e31f8603e6b97cebc4d66e1db5ea7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D91 10360 bytes

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