Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11c2f3ae2885b5e…

MALICIOUS

PDF

34.7 KB Created: 2020-08-20 03:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befc96403df7193366dcd728ed216d97 SHA-1: 7d361f29584af600aa365ca9d936695b6e7d24dd SHA-256: b11c2f3ae2885b5effd377d77fcb49765cfb25781c8ce21e549b26f4cd1cee96
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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=lake+shore+drive+sheet+music+free
    • http://files.blackorbnovel.com/uploads/1/3/0/7/130738889/xasafibilufax_xekamadimobi_gimiganigo.pdf
    • http://files.bryanallankrauss.com/uploads/1/3/1/8/131872238/1960051.pdf
    • http://lomegepid.sustainableswansea.net/uploads/1/3/0/8/130814328/sijarena-pisabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/fumuvumisiganuzozofew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/quick_memo_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/cayley_hamilton_theorem_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/90234172624.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/manual_de_frases_basicas_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/buzofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0068/2906/files/d_d_druid_guide_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/10337568959.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/bogubirapirefulomokepavoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/leave_and_license_agreement_format_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/80411831513.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_off000048ec.bin
a1b9e45267066fa865e219bcbb45ec00d55a37c2955d8209097821baa50643f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EC 5296 bytes
font_01_sfnt_off00005ad6.bin
ea97404efc83bbb193203e3a90daab84c49f149fac16ba12677ba7daf048809b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD6 10300 bytes

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