Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5c8335b48f098…

MALICIOUS

PDF

41.6 KB Created: 2020-09-06 10:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0abfceb700344e1cdee1feedd28689fe SHA-1: 6c2996cf2291f15ab8a9862d446895f40ed8502c SHA-256: f1c5c8335b48f0982926557cfa43d97fab4deffb7e288518bb015a07994ea40d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used to lure users to other sites. It also exhibits characteristics of a PDF link farm, with numerous external PDF links, many of which are benign but likely serve to obscure the malicious intent. The ML classifier strongly indicates maliciousness, and the embedded URL is a primary indicator of this campaign's likely goal of driving traffic to malicious infrastructure.

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.com/wix?keyword=beautiful+pictures++for+mobile In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/1e533a_734089907284489ca16b8f8386ca08c7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d400c_d12a4e1ae0c840e5bd553a614ad7986d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ac8c68_51fab0e4f64b43fc8489cdde1b8f180d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/comment_fusionner_plusieurs_document_en_un_seul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/nebuguvavigamalon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/sample_presentation_design_templates.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7ed05_6754bcc55d624262aa5ae3588c831876.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_75215d55ffe24d41beb6b5705f61ffa5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/234f58_c41285fedb924def8aa0ba150ebee567.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/510a18_53084bd7650f4a0fb6accb0cc907eb16.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_20fe375843044a3baf5c702ce1fd4132.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cec570_cd72e08bc6fd400ca29daf3968e666e5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1c9d9a94d0bb422c9fda0fad570e16f1.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 5348 bytes
SHA-256: c95ff602c4f7aa2d06a644c095b7a083f6fedae353d712b22ea239523349643e
font_01_sfnt_off00007762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 10064 bytes
SHA-256: 199bf7c7150344cacae1be81d91fb79d15cc74c8bb881e1fb33b07b8db3fd9a1

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