Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5caea922d5e092c…

MALICIOUS

PDF

57.7 KB Created: 2020-08-08 02:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69e8d8a2b74ff2da1ef1ea2723e26424 SHA-1: e27c34dc706fdfb0fcdc6ac22a934a1e721f0642 SHA-256: a5caea922d5e092c087a4b08666a941628a257050c007f17276fc53b49171ef4
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with 16 pointing to external PDFs on Shopify, suggesting a link farm or SEO abuse. One of these links, https://ttraff.com/pify?keyword=college+reading+and+writing+skills+pdf, is identified as a known malicious redirector. The document body is heavily obfuscated but contains references to the malicious URL and potentially search engine optimization keywords.

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=college+reading+and+writing+skills+pdf
    • http://files.hollykherndon.com/uploads/1/3/2/6/132683228/nidekobunezum_fawewobazoxi.pdf
    • http://files.miguelchanonafotografo.com/uploads/1/3/0/7/130775373/rerel-wufakinaragu.pdf
    • http://files.thesokofund.org/uploads/1/3/1/6/131636712/gojobefifalu.pdf
    • http://files.takingittothestreetsbuffalo.com/uploads/1/3/1/6/131637635/9965781.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/penguin_readers_level_3_notting_hill.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/application_letter_for_job.pdf
    • https://cdn.shopify.com/s/files/1/0430/9807/9399/files/migopanowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/65206866622.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/affiliate_marketing_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/xadijisojevakujigaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/search_engine_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/57783373293.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/basic_bookkeeping_notes.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/pesquisa_bibliogrfica_o_que.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/wofegugala.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/ibps_exam_calendar_2020_20.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_off0000a512.bin
99a900fc83d1763b7f40fee94b866adde2d2b01dff08017fc414d5001010827a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA512 5268 bytes
font_01_sfnt_off0000b720.bin
0833795322276b2de83fc364faffd4bff4849cab2ec99df76f63257e4c68f215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 9988 bytes

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