Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126a1515414b6e8…

MALICIOUS

PDF

38.8 KB Created: 2020-09-03 05:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa683f0fd8f29994f6309d1d1e280bd SHA-1: e1b20e7ba6055cbc6414465f7bb576c317b39b1c SHA-256: 3126a1515414b6e8056438305de4d51a44499ed111b7cc0de988318f561f0f21
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a 'medical doctor experience certificate format' keyword. This URL is likely used for phishing or to serve further malicious content. The document body also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt to increase visibility. 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.link/wix?keyword=medical+doctor+experience+certificate+format
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/kenume.pdf
    • https://cdn.shopify.com/s/files/1/0462/6717/0970/files/aerosmith_dream_on_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/pipe_band_tune_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/artifex_mundi_apk_full_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/podokif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/56039310511.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/social_listening_report_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/gofaxuboxujatofurasegajo.pdf
    • https://static.usrfiles.com/ugd/79e0dc_473f7815b0e3483fb64fe9e63af04a27.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05996274a114557ba240fe8438ab133.pdf
    • https://static.usrfiles.com/ugd/e1c37d_15e7ab49a3d54e99adec5c4b8f644bb7.pdf
    • https://static.usrfiles.com/ugd/03a576_3b1fc331c10341a49888154a1f92ab96.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/75769982726.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/divavoxinilogerurapoladi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/zeximegalexezunef.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_off00005aac.bin
dd675156eab226b9f0f0d19787c1d9678018d4c935f0f5c3940281c4f5daede7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAC 5196 bytes
font_01_sfnt_off00006c54.bin
12494ba7f68b21ee9a08c0b2a60e45610fa5c186159549e326724034f51c2b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 9984 bytes

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