Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3e1b0bc213c95…

MALICIOUS

PDF

51.6 KB Created: 2020-10-01 09:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 543e336d76ab9ac67557503ef81b8670 SHA-1: d217592fcbcd8489a3ddd24a090f2f554c7bbbcf SHA-256: 73b3e1b0bc213c9508560f3e95c3ea899831f6d350b74dfe9044df4f996fee7f
184 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The primary malicious URL identified is https://cctraff.ru/strik?keyword=cerebro+de+pan+libro+pdf+gratis, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting it under the guise of a free PDF download.

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=cerebro+de+pan+libro+pdf+gratis In PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/86022804164.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/28691685846.pdfIn PDF document text
    • http://files.anastasiahronis.com.au/uploads/1/3/1/4/131408364/4514324.pdfIn PDF document text
    • http://fuvewegun.clevercanidae.com/uploads/1/3/0/8/130874038/wirobipifewe-geriturawalexal-kobajudar.pdfIn PDF document text
    • http://tetonav.surplushousing.com/uploads/1/3/1/3/131398017/680403.pdfIn PDF document text
    • http://seruximo.schultzwines.com/uploads/1/3/0/7/130739456/336709.pdfIn PDF document text
    • http://vuzise.priorecologylab.com/uploads/1/3/1/3/131380467/8664025.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/2058ae2e-7155-437d-97ca-bdec514683b1/37064097155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2070c129-f831-49a6-a122-242711151f15/vexefojanefiwuzereg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0c4044-0b1e-4e7b-8460-54e8c4756eeb/vejupafetolexevanetodot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/0339/7532/files/xadegefadelamip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/vuzaxexovurowo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C07 5256 bytes
SHA-256: 51e2020cda3f3be4d96d80b04ad1b119fab1f19fced4367ec64ea8c354ddc490
font_01_sfnt_off00006de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE8 7976 bytes
SHA-256: 262804033603761354228eae92ee38a5558f8d6915d44741721bc4119fc5174f
font_02_sfnt_off0000844b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844B 11464 bytes
SHA-256: aac863cc49c34548b7c13dae14faab613853b6796c1b0efcf731c6e7eb166592
font_03_sfnt_off0000a997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA997 16296 bytes
SHA-256: 68514bb0cca7d55c4f732e4cc36c87ee824def812b89237e20aafd43afe24de1

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