Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bc77200d53cf99…

MALICIOUS

PDF

73.4 KB Created: 2020-10-30 10:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f055ced33f435ceae6e32ca71e1f3d89 SHA-1: b45cfe7235841e233c73f15ffafe4a9077841fbe SHA-256: 13bc77200d53cf990c6e98c9c09fafe3a4391dc4d00661f9e01cf4cdb2c6c8b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for malicious redirector links, pointing to 'https://ttraff.club/123?keyword=water+cooled+gpu+overheating'. It also contains a heuristic for a PDF link farm, with numerous links to external PDFs, including 'https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/girigigoxagitananiw.pdf'. The document body, though heavily obfuscated, contains the same URL as the redirector link, suggesting the document's primary purpose is to drive traffic to this malicious site.

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=water+cooled+gpu+overheating In PDF document text
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/girigigoxagitananiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5f9b68d6852a8.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/8099674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_5f96bc15dc55f.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/e9ddaf0a339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosagoba/dibaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/arm_compiler_toolchain_assembler_reference.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/97635316374.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/53508612998.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/burivowexemupajegavom.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/preeclampsia_severa_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/saloxokatexiperewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5374/1758/files/dapopaxiwejofalun.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/ashley_madison_alabama_list.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/xejasiw.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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 5228 bytes
SHA-256: d7129be33eb2394473f4f04ccefbc198cf9f94becdf40d597a39a7fca2e96d93
font_01_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 11848 bytes
SHA-256: e91ee829dacf0ca0a5611bcc23fcf925d72c191fd4627cab3973f77b9c0b690e

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