Malicious PDF — malware analysis report

Static analysis result for SHA-256 3821cbb79d813e5a…

MALICIOUS

PDF

46.7 KB Created: 2020-09-14 00:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f9e189164f5907f4c8dcdf41bc3ee2 SHA-1: 9b0c46c718f3a5ceff4f5dae55206922c721b263 SHA-256: 3821cbb79d813e5a4dba5c0ae3fda8e7ffb505f5bcf559a1da64a2b912a629f4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=top+gaming+websites+in+india, which redirects to other potentially harmful content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

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.ru/pify?keyword=top+gaming+websites+in+india
    • http://zukawurov.adashofclass.com/uploads/1/3/1/4/131453574/3685930.pdf
    • http://gavito.friendchristianassembly.com/uploads/1/3/1/3/131379636/fuximuj_rijejozizu_meguwafujegogi_juwelamujifa.pdf
    • http://files.quentinguitar.com/uploads/1/3/0/9/130969926/tudagupovedikesebe.pdf
    • https://static.usrfiles.com/ugd/d775a9_5946b7b4106742c0aeccfbd80155ccc8.pdf
    • https://static.usrfiles.com/ugd/9f2514_9bf683bf665d451aa786b647e5816984.pdf
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/acostarse_present_tense_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/27525271391.pdf
    • https://cdn.shopify.com/s/files/1/0461/8584/0803/files/walmart_flannel_sheet_sets_queen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://static.usrfiles.com/ugd/7598fa_6eb96878582f47dbbea171cff2b3d3f4.pdf
    • https://static.usrfiles.com/ugd/7e6083_7bb613425f784dde91d0bb6c6896bc27.pdf
    • https://static.usrfiles.com/ugd/289c5e_e8a82cb0e6d745e18affdce840d59e1b.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_off00007849.bin
8aad3e6a0145a6b5d4986631865b3e648a8ad0f72f252c06cd06b0c9bfe6f5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7849 5332 bytes
font_01_sfnt_off00008a6b.bin
3f635d7c0995ad49952452f3276959807d0b49deca7143a14e681eb414efdab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6B 10400 bytes

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