Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bff6b88c204fa94…

MALICIOUS

PDF

35.0 KB Created: 2020-09-09 09:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4ca374027b6328e08b1a660ab00c27e SHA-1: 9f91538d7dd1639d34927dc5fdfa48cc9223b895 SHA-256: 7bff6b88c204fa94d77964ca86a7cdaa8194e3f53d085f8054cf6cbb1432a324
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, disguised with a search query for "Ms project 2016 cash flow report". The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of links, many pointing to benign Shopify URLs, likely to improve search engine ranking for malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

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.me/wix?keyword=ms+project+2016+cash+flow+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/36801009135.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/marriage_certificate_in_kerala.pdf
    • https://cdn.shopify.com/s/files/1/0450/3299/7022/files/more_agile_testing_lisa_crispin.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/critical_ethnography_madison.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/sizosijixewilamos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/golosofirejak.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/jefenugakazozofikop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/61395001723.pdf
    • https://static.usrfiles.com/ugd/6116da_deeb7d1efb1b45048b06ce86c1dc7d8e.pdf
    • https://static.usrfiles.com/ugd/a4e402_43140d836a55489ea90be63fcbe8c7e4.pdf
    • https://static.usrfiles.com/ugd/2a1429_81bb863650e84077953f5404a9f7edf4.pdf
    • https://static.usrfiles.com/ugd/a51aec_b9c5682aab994b99bb3f8fdb253cf548.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049d6.bin
43910363211d01b38945ca942e333f332f45fad9647b726b90cc0668dad9adb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x49D6 5756 bytes
font_01_sfnt_off00005d91.bin
1f6969a9f5866059ea037e968ff99a16f20a8b191530fcc775e6f117e69f0923
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D91 9896 bytes