Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d8bd8efb40473f…

MALICIOUS

PDF

34.9 KB Created: 2020-10-01 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 25d0781299228fc06622feb6a385e3f3 SHA-1: 855cc16827fd2c3278a5f91e7d44860543059993 SHA-256: c4d8bd8efb40473ff1425b0722e395c721ac762cdc05272462da080796d69f8d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 3

  • 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.
  • 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=el+pastorcito+mentiroso+para+colorear In PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/39518853083.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/28959212993.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/84817884365.pdfIn PDF document text
    • https://site-1039720.mozfiles.com/files/1039720/vumotapa.pdfIn PDF document text
    • https://site-1037024.mozfiles.com/files/1037024/95542458284.pdfIn PDF document text
    • http://vivevuk.thenourishedcoeliac.com/uploads/1/3/1/6/131606758/73904e82.pdfIn PDF document text
    • http://laligor.america-wecare.com/uploads/1/3/0/8/130873843/wajufaga.pdfIn PDF document text
    • http://domibe.papercranehmb.com/uploads/1/3/1/6/131606490/jazedefapafejilibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/vogejufobomimokabovov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/wonajonalimiwexemad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0819/5735/files/hero_clicker_hack_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1031/2360/files/fifufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472b7c96-e3d4-4930-821a-3fe0ad464624/lativu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ace0cee-b674-4b5f-bfdf-2c30ad991127/mizebimokalixezi.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 5036 bytes
SHA-256: 1f45ee21d148839ae9188a4e55faf1a4ef20973ca790380682fe2908789fd0c7

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