Malicious PDF — malware analysis report

Static analysis result for SHA-256 59946734cc21b272…

MALICIOUS

PDF

41.5 KB Created: 2020-10-04 01:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37a1ff0e14bccdbea126166a10329fa8 SHA-1: 52caef9aece7cf01bcc81c49e666ee33a6a80ccc SHA-256: 59946734cc21b272a4ee60c34ad24201ff382f2df713d6e3477d9e6995f5c871
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The primary malicious URL identified is 'https://cctraff.ru/strik?keyword=arx+fatalis+stat+guide', which is likely used to distribute further malicious content. The ML classifier also strongly indicated maliciousness, supporting the presence of a malicious redirector and link farm.

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://cctraff.ru/strik?keyword=arx+fatalis+stat+guide In PDF document text
    • https://site-1038985.mozfiles.com/files/1038985/vuvebo.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/xonaxap.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/23841230627.pdfIn PDF document text
    • https://site-1036894.mozfiles.com/files/1036894/bepelusokadumawigow.pdfIn PDF document text
    • https://site-1042740.mozfiles.com/files/1042740/90299500056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/927582b3-a598-43ba-b97a-579d6977c89f/satafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e71d7b9-518f-4e86-a169-baaa1eef5239/50811208785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f41645-99c2-4b94-86eb-b01b260d2177/45966824584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861e98ed-28e3-4592-a7e0-4b35f8686833/lakiref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7896/5656/files/using_the_microscope_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/josh_hephner_memorial_wrestling_tournament.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_off000060ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 5132 bytes
SHA-256: 37a80363baa831f7726eb64e6ee69915301c565f2aa5e2f40e1ac54cc0e554d7
font_01_sfnt_off00007272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7272 12144 bytes
SHA-256: b22dda2c43ae7eab06ab0e0f3f5ce3792bf0e91acb5986bc59e9cab39162b8cc

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