Malicious PDF — malware analysis report

Static analysis result for SHA-256 79acd1b057ad9edd…

MALICIOUS

PDF

42.2 KB Created: 2020-10-31 13:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: eca9a489ea61265a979aa1dfd7a00c44 SHA-1: e4bcecc1b06ab3964d21c66ae04eec7bf04065fb SHA-256: 79acd1b057ad9edd97303fee1c802708b82cf924fbce7b8fa9d478e44ac586df
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.ru/123?keyword=toddlers+and+tiaras+full+episodes In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/xidobitabevexat_pawoso.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/bofisovegok.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/1aaf690b-8ebe-4f59-9cc4-5d8f7ab771c9/22131076893.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/98850871326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca98df7-f4ce-481a-a692-3c3219eafe59/87352390526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35301ca1-87ba-4580-a679-e7909cbd347e/rupojawasimigasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2879be16-0b91-47b7-bcd4-4e77fd7460e0/ropika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2131d100-ab74-41b6-8700-d9aa2901b9d1/78323322141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e284388-1746-4ae3-a292-82785ebe6129/xepetepijozubosuzike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03459b0c-b800-4b81-95ef-15ddf1865e5f/mixatevisefuwemidujapozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a75991-5ee7-4a4f-b80c-c73d85ec3225/91297472989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40732b23-0552-48f3-b3d5-79bae4719eec/24539171655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2309475-971a-400d-b009-5fc0d8049684/kekodeguderota.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_off000064d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 4984 bytes
SHA-256: c9a5479281abbe64c491d119d24d595aede416e48d11b21cbe23d4be68afd09c
font_01_sfnt_off000075d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D7 11244 bytes
SHA-256: 4ba190ff47913b624a258a8f6ed31ade729a471da53d02345c8dcea02ee21100

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