Malicious PDF — malware analysis report

Static analysis result for SHA-256 be538457bb54ac02…

MALICIOUS

PDF

42.0 KB Created: 2020-10-02 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a366ff150d69f3d775b6be5bb45bff53 SHA-1: e50f7bc28e474c7cb40f95c4ad2021f0558d67c6 SHA-256: be538457bb54ac02466d878d08daf049e61a8f83f5d3ba4a6fe0de68707f8ed4
184 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to disposable domains and redirectors, indicating a link farm designed for malicious redirection. The document body, while heavily obfuscated, contains URLs that are likely part of this redirection scheme, including a critical redirector link to 'cctraff.ru'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=unshakeable+tony+robbins+book+pdf In PDF document text
    • http://files.isetteconi.com/uploads/1/3/0/8/130814529/1dc65b6e34ec39d.pdfIn PDF document text
    • http://xokal.uteartphoto.com/uploads/1/3/0/7/130775229/vexepekakig.pdfIn PDF document text
    • http://jatobela.romanstravelwithcare.com/uploads/1/3/1/3/131379540/ritaguravegugan.pdfIn PDF document text
    • http://files.hayfieldsecondarychoirs.com/uploads/1/3/1/4/131455832/pezerimakewusezufip.pdfIn PDF document text
    • http://files.meadowshomegardenclub.com/uploads/1/3/1/6/131606165/jemit_tezijesik_zukasagaboripe_zibusasulexefi.pdfIn PDF document text
    • https://site-1038520.mozfiles.com/files/1038520/dodexor.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/zavesaxejobo.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/33137560380.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/namiporigubuwu.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/1/0431/0374/8247/files/new_vision_charter_school_bronx_ny.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0821/7247/files/artemis_fowl_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf4f5f2-5ef4-4708-a2e7-52c485c99ea6/makazanamitokafevat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5df840e-b0a6-4969-aa3b-a34d22330677/wepisofokufava.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_off000065de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 5424 bytes
SHA-256: 44e78bb6f09fa43343611d23a823369e77e0ecc8f2a83255d31003c2a64aa554
font_01_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 10300 bytes
SHA-256: 9afcb58dddb4bfb871f0d300f6a29daf9c7933a73c765e868b5b39feb2cb73ca

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