Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae9ecda133ff34a…

MALICIOUS

PDF

35.2 KB Created: 2020-10-03 07:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dd0ec07d066446f68284d2736bc90ab5 SHA-1: e35348ae1150c8be3f5b7cb145e35329eb86ef17 SHA-256: eae9ecda133ff34a8741544d85be61f34eb15b746842875a7ceae552c4ecc344
184 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=barron%2527+s+gre+verbal+workbook+pdf`. The document body, though heavily obfuscated, contains this URL and other links to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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=barron%2527+s+gre+verbal+workbook+pdf In PDF document text
    • https://site-1041181.mozfiles.com/files/1041181/62783673195.pdfIn PDF document text
    • https://site-1038690.mozfiles.com/files/1038690/24647202131.pdfIn PDF document text
    • https://site-1042971.mozfiles.com/files/1042971/lesuzedekumoso.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/karabuzegipofinep.pdfIn PDF document text
    • https://site-1043329.mozfiles.com/files/1043329/77769948343.pdfIn PDF document text
    • http://files.graphicatech.com/uploads/1/3/0/7/130776611/54227847.pdfIn PDF document text
    • http://files.thepeoplesroaster.com/uploads/1/3/1/4/131438684/kimififide.pdfIn PDF document text
    • https://site-1039806.mozfiles.com/files/1039806/lexosavoteduzebakunajo.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/gaguwopaluvawat.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/fimirate.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/mozubasarejeferebixir.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/69bec068-feee-4e72-8b91-e7784c195911/78692505093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf1920b-c77d-48b6-863b-6c64053311ef/78677086633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e1077c-e24d-4934-8aeb-a812f59ab208/xomagixojigejab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caaff40-6f13-4905-bd18-ed84e0c4f9dd/pavusolefutedokokiwar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce902e1-f0eb-4745-b071-3ee62a280f21/fukilumi.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_off00004b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9A 5648 bytes
SHA-256: c6ac3fea3ed4904e894e2487e099c2e06968818bc7e12a8be8a398b7b3de9808
font_01_sfnt_off00005f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F00 9684 bytes
SHA-256: 5fa8fe706f42368685d8851daa30869843e708704fbd80af5e41138a8939ef9c

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