Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe295189cefb2d7…

MALICIOUS

PDF

39.1 KB Created: 2020-08-19 09:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da543c743a4c9b21584e4c5c13dffeb SHA-1: 37580387c9f135430712013f4e34dda66c6ef534 SHA-256: cfe295189cefb2d7f69656851a3ed323b1ae1e83ca5633ee54277b8711abb03f
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, constituting a link farm designed to appear as search results. One of these links, 'https://ttraff.ru/pify?keyword=kiran+makkar+ielts+speaking+pdf+2018', redirects to known malicious infrastructure, indicating a phishing or redirection attempt. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=kiran+makkar+ielts+speaking+pdf+2018
    • http://files.europlast-okna.pl/uploads/1/3/1/4/131407112/09d61e.pdf
    • http://files.fereks.net/uploads/1/3/0/7/130739919/wokexogodarof.pdf
    • http://puleligo.my-battalion.com/uploads/1/3/1/6/131607600/e20fc3ff6f.pdf
    • http://files.friendsofbishopswood.com/uploads/1/3/1/6/131606546/9374360.pdf
    • http://files.bamyield.org/uploads/1/3/1/8/131856050/0a5d91.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/88742698253.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/12296310575.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/91151123900.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/be_smart_english_workshop.pdf
    • https://cdn.shopify.com/s/files/1/0438/3437/6352/files/fevuboxivim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/lomatimetod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/bbc_compacta_class_12_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/bofejagupazipibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/wow_tiger_meat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/black_woman_names.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/kptcl_junior_assistant_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/hazardous_waste_management_training.pdf
    • https://cdn.shopify.com/s/files/1/0433/3898/9718/files/rupupire.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_off0000546c.bin
b14f3e364285917b98625342cb175586f8523699567e49cfd4fc6afe893429cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x546C 5916 bytes
font_01_sfnt_off0000686d.bin
3ccf89e32b332b3f966a7d3570ccefbb9f743b0557ee9badabf6a50868719cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686D 12064 bytes

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