Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f39107395a08e00…

MALICIOUS

PDF

52.6 KB Created: 2020-08-22 21:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135f09352e42a684ee1a8fca004b5514 SHA-1: 63d03d9104971ea22b279188f8e6f23dddacb288 SHA-256: 8f39107395a08e00829f4ec48b8f727428dc5889767eca222730b05d933bca71
128 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, ttraff.com. This domain is used in conjunction with a lure related to an admission form, suggesting a phishing attempt. The PDF also hosts a large number of other links, many pointing to Shopify, which is likely part of a link farm to improve SEO for malicious content. The presence of a 'download button' heuristic further supports the lure to click on a link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=admission+form+du+llb+2018
    • http://files.wihpt.com/uploads/1/3/1/3/131379820/8331031.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/99250808521.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/similarities_between_probability_and_nonprobability_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2454/files/cortex_m0_generic_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/manual_de_epidemiologia_y_salud_publica_hernandez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/65773263955.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4065/files/safari_books_online_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/candidate_testing_service_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/lepimak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0547/7023/files/reduce_file_size_online_without_losing_quality.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/kotiwuluzolajuxisumofusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0402/files/periodic_table_hd_image.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_off00008f92.bin
645036c1f7224f362fea76e10c206af15febc6568ffb8d3bf8b7da13e8a83e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F92 5492 bytes
font_01_sfnt_off0000a226.bin
76d257eb372779d0fec5d8cc7431e9e2eac54b25b20ba36432701c5f410994d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA226 10428 bytes

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