Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f054855f4445a9…

MALICIOUS

PDF

35.1 KB Created: 2020-09-18 12:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93a3096f576dbd193be9057eab7ed5c SHA-1: 177192b0eb3f3d6a78928b945ec9d1a39f3d6360 SHA-256: 26f054855f4445a9db115de3bc312b57bf32b6077d8dfa2843229105af559e5c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely intended to lead the user to a malicious site. The document body also contains numerous embedded URLs, many of which point to benign content, but the presence of the malicious redirector link and the ML classifier's high confidence score indicate a malicious intent. The document appears to be a lure for a phishing or malware distribution campaign.

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/wix?keyword=heartburn+nora+ephron+pdf+download
    • http://files.4burlingtonwoods.com/uploads/1/3/0/7/130775866/duwizifenej.pdf
    • https://948aed58-0344-4283-8033-d1006a2d0864.filesusr.com/ugd/904a8b_a22e36745781457d9c06482457af367e.pdf?index=true
    • https://b19b2e4a-b5e5-4b4e-b81e-1ac400ff9e92.filesusr.com/ugd/a4c1fa_1bd617a35da94bb29d76d831750a5a01.pdf?index=true
    • https://97df7d36-fdba-4535-80cf-39e13a00d3b5.filesusr.com/ugd/fd30ac_e236d928e032474aa1178e8fd06e609a.pdf?index=true
    • https://a533d6bc-1fce-4ad9-bb0e-5f4ae8647fb2.filesusr.com/ugd/fedf23_3d7caff376f742e79ce99173692dae61.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/fekuwigobibunifetu.pdf
    • https://cdn.shopify.com/s/files/1/0463/6796/5339/files/what_is_pellon_fabric_used_for.pdf
    • https://cdn.shopify.com/s/files/1/0435/4493/6599/files/tametazosodorufezudibabir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/excel_spreadsheet_checklist_template.pdf
    • https://a5c38ddf-43ca-4549-8484-ddef49d13078.filesusr.com/ugd/e1c37d_85c1b078edc44d7185901233230f3143.pdf?index=true
    • https://863c2005-6d9a-4261-be8f-79d41cbe9c2d.filesusr.com/ugd/704f6c_97eb2a7519b04fd5985e53d6b4d6e57c.pdf?index=true
    • https://7753b01d-5d35-4508-ab6c-1e4ac6ee1199.filesusr.com/ugd/3db607_6b7bb5ee9846435c9638faca8b8508fa.pdf?index=true
    • https://81cd5016-7b39-4344-8088-159db44858c2.filesusr.com/ugd/debdc1_20edf29b82fd4fdbb1c8e9b717b59a21.pdf?index=true
    • https://6d82f2f6-2ed7-4bc1-af0a-b5e93732eb17.filesusr.com/ugd/e1a791_f81979714dc64439ae1da8dde988f889.pdf?index=true
    • 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_off00004ca2.bin
af8d04b33855bce6b9b39c4473535f3162fb2f35e45084a3be76aae236593f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA2 5144 bytes
font_01_sfnt_off00005e28.bin
ac336213ca88c014e367fc8b6bd9317e600b9034e4eb4e7b657b5921e5e0327c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 9744 bytes

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