Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28b9d3646b9eb6f…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 20:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a8669da198703a0d8fcc003d2e3aa7 SHA-1: 3a733c598fc1bf4267f21dee76b02c3699fb39f9 SHA-256: b28b9d3646b9eb6f447a974ceec4845419c2b8b35b0f275814b8dcc0deaf6232
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=list+of+recent+mergers+and+acquisitions+in+zimbabwe+pdf', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains, likely for SEO manipulation 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.cc/pify?keyword=list+of+recent+mergers+and+acquisitions+in+zimbabwe+pdf
    • http://files.college-sport.org/uploads/1/3/2/3/132302916/jukizamixixulo.pdf
    • http://files.oakmountainfirewood.com/uploads/1/3/0/8/130874010/7878770.pdf
    • http://files.gallerylucid.com/uploads/1/3/1/3/131398250/nepizegoxixi-wusuwuzetuk-xiwowiritakul-bidebet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/rrb_je_exam_previous_year_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/viwag.pdf
    • https://cdn.shopify.com/s/files/1/0438/2444/7638/files/xaratazanugaxilezapolagul.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/git_bash_commands.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/fulodaneriwozod.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/viwenirilazuzo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/turosexok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/28696682481.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/panisigofinore.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/nyc_subway_system_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/50724401592.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_off00005e17.bin
3ee41b0a10f82a24a7b93ed6e397d83261c9258f03220e7e133c7bd466a38c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E17 5792 bytes
font_01_sfnt_off000071cb.bin
d34cace38152689e2b657717d86a0b3c46db234c8a74d03abd8341009ca99602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 10204 bytes

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