Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bca68d56a50288…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e05ddd9768f069e18fc848a298fc71c SHA-1: 5d2ce9b1f8fb07fabe840ea5763167d9cd20015f SHA-256: 25bca68d56a5028884b2fee63ce7655bb0fc1a33fcf785ecf0d6bf30710465cb
120 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior through a high density of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=les%20matieres%20scolaires%20exercices%20pdf. Another heuristic flagged it as a PDF link farm, with numerous links pointing to Shopify domains, suggesting an attempt at SEO manipulation or traffic redirection. No scripts were extracted, but the sheer volume of links indicates a likely intent to lead users to harmful content or exploit search engine vulnerabilities.

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/wb?keyword=les%20matieres%20scolaires%20exercices%20pdf
    • http://files.computerzone1.com/uploads/1/3/1/6/131606668/wojatixodo.pdf
    • http://minotum.crystalcaillech.com/uploads/1/3/0/9/130969332/gofavijiki_kokeguvowu.pdf
    • http://kugur.spiritofthe8thfire.com/uploads/1/3/1/4/131438137/movulax_mewuvovor_zoromi.pdf
    • http://files.millhouseconsultants.com/uploads/1/3/1/4/131406592/xufitigajibikuro.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/33433834713.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/maxojivug.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/27728749311.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/baxutofusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/biguxixagezilexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/vogakuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/12760869494.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8479/files/56162162361.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/nisizagisuwox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6822/files/22617153458.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_off00006059.bin
179dc2befb3ea55d1d4a5e1f8f46c3c3bb19e9a667aca22653555d299231139b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6059 5312 bytes
font_01_sfnt_off0000724f.bin
0cb8ba71446aa93852598bfb184dccc1d9d39557f8f646d78d731acda1136929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724F 11648 bytes

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