Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22782be76428a9f…

MALICIOUS

PDF

57.4 KB Created: 2020-10-28 09:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8d035a253bef3c99ff0493ab9be775c SHA-1: 779280887c2ac8ad6f715729550e2cb77e4fe608 SHA-256: c22782be76428a9f1bd7dece10f2363acfc09dbb3274a4377f2662dfb83f0f02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it functions as a redirector to malicious infrastructure. The primary URL, 'https://ttraff.club/123?keyword=higher+lattice+energy+kcl+or+mgo', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files, suggesting a link farm or SEO poisoning tactic to lure victims. The ML classifier also strongly indicated maliciousness.

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.club/123?keyword=higher+lattice+energy+kcl+or+mgo
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5f9151ddd7479.pdf
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f893945c04b5.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f896434bbada.pdf
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f9677f7c4821.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f879b3c68fcb.pdf
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f896c9595d47.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8ca592b131b.pdf
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8c91d47f3f0.pdf
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5f98dbf28ca73.pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f96b561528b6.pdf
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5f90ce4e4cbfb.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f98cd8ee0376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedimuta/babowowerataw.pdf
    • https://uploads.strikinglycdn.com/files/1c8a34f6-4162-4f98-bc9b-ba7519ab5faf/98947738592.pdf
    • https://uploads.strikinglycdn.com/files/eba9866b-5d39-4caf-a787-ac07f414808d/5725509442.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/11926761769.pdf
    • https://cdn.shopify.com/s/files/1/0504/4279/7225/files/5278854379.pdf
    • https://cdn.shopify.com/s/files/1/0500/9624/2856/files/snail_mail_game_download_ios.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/17992735348.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f53.bin
b2beaa6a8e2876769ef52a8a7f9a437b5fba442514846fe0df70e9abc05f5cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F53 5160 bytes
font_01_sfnt_off0000b0bc.bin
2f7cd27f4f5715c46f3a7aaea8582edd4a5343c308f8c57bc9fbfd4d69ea035c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 12016 bytes

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