Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb30aed21408a3c…

MALICIOUS

PDF

47.9 KB Created: 2020-08-20 03:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025f01376b299b9887208ea9394af3f3 SHA-1: 23ce1969c7926a42e72c233f1958e0b8d2cf6a92 SHA-256: 8fb30aed21408a3c157efe577e7aa2d3cb32746dd0cb00a20cb73aa0770985b0
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=information+about+computer+science+engineering'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains the primary malicious URL, suggesting the intent is to redirect users to malicious infrastructure.

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.com/pify?keyword=information+about+computer+science+engineering
    • http://files.bressefarms.com/uploads/1/3/2/7/132741162/2768489.pdf
    • http://files.edwardkhrisfernandez.com/uploads/1/3/1/0/131070894/wigisamopojapurev.pdf
    • http://files.khatso.net/uploads/1/3/1/3/131381782/mozunusapirav-poderopaga-sovilamupoki-zikopoponexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/2912996885.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/92251721822.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/8999/files/pdf_to_word_editor_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/oligopoly_game_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugerivedisabuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/kiwimetalutepero.pdf
    • https://cdn.shopify.com/s/files/1/0430/4096/4759/files/s_t_full_form_bus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/78218733605.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/boris_johnson_eu_brexit_deal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/86411058136.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_off00007c27.bin
ca813cfef788c78636673c8aabe5e9279057debea17ca171930401990af56a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C27 5380 bytes
font_01_sfnt_off00008e4f.bin
e621910886ccc3ad0876dadb3cec852d92d435aae20f87cc67ce9ed2a7b40416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4F 10648 bytes

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