Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a69e9c5c3d5f87…

MALICIOUS

PDF

54.3 KB Created: 2020-11-01 21:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5ba86fff50596d1ec311233ed59cab52 SHA-1: 76d3a938bc136b100ae98723dabaad497e526cf0 SHA-256: 36a69e9c5c3d5f87170f615ba65e96b8ef817121240acb4148c911db172cd295
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector infrastructure. The document also features a large number of external PDF links, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports a phishing or malicious content distribution vector.

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 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.
  • 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://ttraff.club/pify?keyword=planes+of+the+face+3d In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9856551106e.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/9b84a7aabd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f99b7d6b8c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f8a1b70e2c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8754b7ea964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9568bd4c4fb.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/4489358.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/8731345.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/rufudijavorexot-gekurebi.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/xusaxog_tabipox_potorobakude_milulogufasabof.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/f5576905-b969-4491-ba3c-81af195c6204/presence_of_pacemaker_icd_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad30f73-e7ed-4726-be2c-7ca0942d3bd9/misozugunulagix.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_off0000961d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x961D 5180 bytes
SHA-256: 22b0d6433e9d0955e62e22793e7f69b2ad04b033ea98ac1c729c2e980fd75c5a
font_01_sfnt_off0000a7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B9 10936 bytes
SHA-256: 31cf9311a1bcbe4a7fbb23880984a5a0e0df8133f2a3769710107cd4f97efd87

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