Malicious PDF — malware analysis report

Static analysis result for SHA-256 5928c85a848d689d…

MALICIOUS

PDF

43.4 KB Created: 2020-10-11 19:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 245cac89d1a139445e0523486637a66d SHA-1: eac054f0ebe394009f6a03add32626b5f09818d4 SHA-256: 5928c85a848d689df238ea505eaaf52dba3f3dc8ec5247fa5a696cc0d85afb82
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=goddess+kiss+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links to disposable domains further indicates a link farm designed to distribute malicious content or phish for information.

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 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=goddess+kiss+guide In PDF document text
    • https://site-1040975.mozfiles.com/files/1040975/93748416611.pdfIn PDF document text
    • https://site-1041866.mozfiles.com/files/1041866/ziveridotebowenuro.pdfIn PDF document text
    • https://site-1039707.mozfiles.com/files/1039707/savinuzosazowebu.pdfIn PDF document text
    • https://site-1038331.mozfiles.com/files/1038331/85551352756.pdfIn PDF document text
    • https://site-1040878.mozfiles.com/files/1040878/98777527378.pdfIn PDF document text
    • https://site-1038453.mozfiles.com/files/1038453/71489929581.pdfIn PDF document text
    • https://site-1043538.mozfiles.com/files/1043538/17808084486.pdfIn PDF document text
    • https://site-1039270.mozfiles.com/files/1039270/51000225421.pdfIn PDF document text
    • http://vazopuzig.cimro.com/uploads/1/3/1/4/131437490/7575847.pdfIn PDF document text
    • http://gulax.arthealswarwounds.com/uploads/1/3/1/4/131453048/57bc29571dcfba5.pdfIn PDF document text
    • https://site-1043802.mozfiles.com/files/1043802/dofuwazumatupakon.pdfIn PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/tidekewafololakawa.pdfIn PDF document text
    • https://site-1039382.mozfiles.com/files/1039382/68480909730.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/sumogudoxux.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_off00006be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE7 4752 bytes
SHA-256: b33f265a5032f1a0e6d9eeaebcc0a3402875218d2a3a213698b12cdace96a32a
font_01_sfnt_off00007c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 10684 bytes
SHA-256: 028228603574b649457de27455d2c7c3070213142bba70c6209f6a041c9c7609

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