Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b84751ba2e6f17e…

MALICIOUS

PDF

41.8 KB Created: 2020-09-02 20:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af75dfdec386544780a87c9cc23e9ab2 SHA-1: 6e55283f0afcd4d4cff68bfd54a1a92f80462030 SHA-256: 8b84751ba2e6f17e064e93526e42d03733da1eaa6962e55d17e25fd18777575f
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, some hosted on Shopify. The presence of a 'download button' heuristic further supports the lure mechanism. The primary malicious IOC is the redirector URL.

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/wix?keyword=zlib1.+dll+file+for+epsxe+emulator
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/17860202892.pdf
    • https://cdn.shopify.com/s/files/1/0433/9826/7029/files/nice_guidelines_neurosyphilis.pdf
    • https://cdn.shopify.com/s/files/1/0463/0826/2050/files/75382629111.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/38993982512.pdf
    • https://static.usrfiles.com/ugd/20d83a_255d20faff994dbaa59bf2445ce24809.pdf
    • https://static.usrfiles.com/ugd/5360f8_08c6ec871fab48018f1615cd43e9371d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc75df98817d440eaba87af0d092cd52.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e233a5d4db24ba48de029a1a50602e7.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/kefemijim.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/tumide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/adding_fractions_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8369/4247/files/8786099549.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/imperialism_map_activity_us_history_answer_key.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_off0000643e.bin
f6c20d929595bb39c0cb6d0f733f04a3a17498cfc66687ebb528ac5f45ab63fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5436 bytes
font_01_sfnt_off000076ac.bin
cdd48823ed799b7cc25e3e19cff2437d094df61a202e152ea9be134f1353906d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 10340 bytes

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