Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d5d22f3a927485…

MALICIOUS

PDF

40.7 KB Created: 2020-10-11 22:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83ec26bca5ad13cc9cca11afb6577711 SHA-1: 7a38e44179aa429f8055504e1df7260556a9583a SHA-256: 15d5d22f3a927485831c03da5879e10e13bc3378e7e167d1f70e64079c7a5ae7
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of embedded links pointing to a large number of external PDF files hosted on disposable domains. The primary URL, `https://cctraff.ru/strik?keyword=izuku+x+ochako+fanfiction`, appears to be a redirector, likely leading to malicious content or further stages of an attack. The document body contains garbled text and embedded URLs, suggesting it is not intended for legitimate user consumption but rather as a lure or a distribution mechanism.

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=izuku+x+ochako+fanfiction In PDF document text
    • http://bulolugi.abundantlifemedical.com/uploads/1/3/0/8/130874683/vilizo.pdfIn PDF document text
    • http://files.teevo.co.uk/uploads/1/3/1/3/131381363/7627148.pdfIn PDF document text
    • http://rigukoz.windriverwild.com/uploads/1/3/1/6/131636725/jefasidep.pdfIn PDF document text
    • http://files.marianeth.com/uploads/1/3/1/1/131164556/fezubulanavufuf.pdfIn PDF document text
    • http://files.hardawayart.com/uploads/1/3/1/1/131164275/gagiwapekosodid_lifurow_veveman_masuxulotago.pdfIn PDF document text
    • https://site-1039535.mozfiles.com/files/1039535/nuresafap.pdfIn PDF document text
    • https://site-1043405.mozfiles.com/files/1043405/62884847909.pdfIn PDF document text
    • https://site-1038794.mozfiles.com/files/1038794/43080166698.pdfIn PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/30052067823.pdfIn PDF document text
    • https://site-1038995.mozfiles.com/files/1038995/7960008928.pdfIn PDF document text
    • http://files.johnsondistributioncollc.com/uploads/1/3/1/4/131438046/02327568dd.pdfIn PDF document text
    • http://files.coobcoffee.com/uploads/1/3/1/6/131606094/rokirebekafav_bopasix_buvokexelune_xijudexufupasag.pdfIn PDF document text
    • http://dunavo.retrochem.com/uploads/1/3/1/4/131412290/titimosorevi_xizik.pdfIn PDF document text
    • http://files.bambooble.com/uploads/1/3/1/1/131163846/tewirubegefopeb.pdfIn PDF document text
    • http://files.residentialprojectsofchoice.greatwebsitebuilder.com/uploads/1/3/0/7/130739887/7044284.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/64361846794.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/xuzigavekepofufudaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6396 4780 bytes
SHA-256: 0e34377c701babf73b89282dc7cff26d846812ab66763dd5d88543168d8cc592
font_01_sfnt_off000073df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 10060 bytes
SHA-256: 93c7a851426b3e040ac80c152aca82c3c2203aefcfd1d20278b5889112a90f8b

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