Malicious PDF — malware analysis report

Static analysis result for SHA-256 394eb736c775ffdc…

MALICIOUS

PDF

37.5 KB Created: 2020-08-18 20:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c91cd108cd9f09afa5f66127ed0ea5a SHA-1: 9d333d737b36869d96e47a40a44d28b283292d78 SHA-256: 394eb736c775ffdc183add0b7308f06238c2187ce724f70cd63b2ce121bc8782
120 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a direct link to a known malicious redirector, ttraff.cc, which is used to obscure the final malicious destination. The document body text, while appearing to be educational worksheets, is likely a lure to encourage users to click the malicious link.

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.cc/pify?keyword=free+english+worksheets+for+grade+5
    • http://files.colinbergmusic.com/uploads/1/3/1/1/131163898/d9a51c1.pdf
    • http://binab.themightypsi.org/uploads/1/3/1/4/131453293/7797389.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/pobinafudikuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/neronunuzaguzop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/chac_mool_carlos_fuentes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/rezupitupikivobeposav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/25042553545.pdf
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/alexander_technique_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/mutebapu.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_off00005695.bin
85b4b9eb1473111a9eca90b6d3f6003117eee7be65466e80c0189879ef7fcb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5695 5404 bytes
font_01_sfnt_off0000690a.bin
2d2f3672510789a3b1d0c8710fcafa1576cfe1764550dbdbc68d8fcc77c98a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 9440 bytes

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