Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac48cfd5bc46627c…

MALICIOUS

PDF

35.2 KB Created: 2020-10-03 15:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c5f04c285d8253e6ed672f7b480f72d SHA-1: e3796cd0d4164926f19de4ff7455384094fdd4f7 SHA-256: ac48cfd5bc46627c116280e9acf412004b9b523bb63d483fe639256a0d83de53
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on disposable domains, indicative of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=massachusetts+rmv+driver%2527s+manual+pdf, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=massachusetts+rmv+driver%2527s+manual+pdf In PDF document text
    • https://site-1042990.mozfiles.com/files/1042990/64197251572.pdfIn PDF document text
    • https://site-1039848.mozfiles.com/files/1039848/57690680480.pdfIn PDF document text
    • https://site-1037824.mozfiles.com/files/1037824/jodobetupa.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/6007109426.pdfIn PDF document text
    • https://site-1038527.mozfiles.com/files/1038527/9923862588.pdfIn PDF document text
    • http://xebiw.hrkamins.com/uploads/1/3/1/4/131409090/levuzumunofisimukana.pdfIn PDF document text
    • http://lazagoru.davidfrankdesigns.com/uploads/1/3/0/7/130776089/gogizuseronev-lekor.pdfIn PDF document text
    • http://files.ilovedermalicious.com/uploads/1/3/1/6/131606672/4950952.pdfIn PDF document text
    • http://files.erinmtorkelson.com/uploads/1/3/1/4/131406535/f3c7d81775.pdfIn PDF document text
    • https://site-1041761.mozfiles.com/files/1041761/febixuvafifaligebisuwuxi.pdfIn PDF document text
    • https://site-1038762.mozfiles.com/files/1038762/22237466308.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/sibokorexijosazisuf.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/roxekobatexu.pdfIn PDF document text
    • http://files.cajunmadefoods.com/uploads/1/3/0/7/130775653/dekojuxawedozo_jegoma.pdfIn PDF document text
    • http://monemeli.yashbangera.com/uploads/1/3/1/4/131453325/526625.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_off00004adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADC 5496 bytes
SHA-256: d6b1b1d7074100fa1e1ffde0f1cbe5cc97ba00412bd9a43c83f76c34d6ef712a
font_01_sfnt_off00005d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 9888 bytes
SHA-256: 8f3a8f3fd36e8632c87d0f29c016e130ca00f835494f7bd912a8745406e3f204

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