Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fcdaed0704aa24…

MALICIOUS

PDF

34.0 KB Created: 2020-10-02 06:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ac5a75f3d66b6474327e7c406d82a9b SHA-1: 7b184c113f2640927b4427f40225145b54fa468b SHA-256: c1fcdaed0704aa248bff91b19b186c5fee09071eebdf466e359645ad777f4776
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, masquerading as academic resources. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of these links, 'https://gettraff.ru/strik?keyword=precalculus+functions+and+graphs+12th+edition+pdf', points to known malicious redirector infrastructure. This suggests the document is part of a link farm designed to redirect users to potentially harmful sites, likely for malware distribution or phishing.

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://gettraff.ru/strik?keyword=precalculus+functions+and+graphs+12th+edition+pdf In PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/91314308786.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/28763872080.pdfIn PDF document text
    • https://site-1042014.mozfiles.com/files/1042014/womugeziroliliw.pdfIn PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/bedofixitesenaxuri.pdfIn PDF document text
    • http://files.azdoodleranch.com/uploads/1/3/0/7/130776462/velowaxevavalexukaxe.pdfIn PDF document text
    • http://files.albertvilleband.com/uploads/1/3/1/3/131381612/21b814a098.pdfIn PDF document text
    • http://files.campcrescentmoon.org/uploads/1/3/0/9/130969678/9560755.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/nosarugevilukujiv.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/50587975924.pdfIn PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/suganeraxuk.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/90494333836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/kovuzef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/alien_periodic_table_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3103/5543/files/how_to_tie_a_toga_man.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/verweile_doch_du_bist_so_schn_faust.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0206/9667/files/56735687052.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_off0000464b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x464B 5604 bytes
SHA-256: 6501591221ba84c009b93e7aac99a377a2ce4c52e0ad503ee4d8338559dd9fa7
font_01_sfnt_off00005956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5956 9772 bytes
SHA-256: 60b912a931236290a80e4469b9097d2ffed8fb5ab32d40644f85254f3def9cf0

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