Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fcde616c13a9b2…

MALICIOUS

PDF

49.4 KB Created: 2020-11-03 12:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf5fd6f41075144aa625faa8f5799b09 SHA-1: 9c5cdd38542c81ef6c684cea296e1009c35daf2a SHA-256: 65fcde616c13a9b230c7c2025604f330a30acf9535098ec3f84488b49fd711d4
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://gettraff.ru/aws?keyword=cover+letter+introduction+paragraph+sample In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/godupivisevajidino.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/52b57d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/nefisir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7230c3e-21f9-49b4-9c2d-879f0a77b591/24937283028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7565f2f5-c9fd-4d66-ade7-551f18c820a5/jadasu.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/54825354440.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/canterbury_tales_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/lajudidolefajofaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45852681-3a33-45fa-9eb0-dbe59816cea9/38298424611.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/xoragakavito.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ae0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9AE0 19048 bytes
SHA-256: 44795ae2011a81725af80d649ca5d3b9f3ffc9207eec69c83a55fb20a15381f7
font_00_sfnt_off00006637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 5452 bytes
SHA-256: 73c4a57aa3effb9d97f3145359a76f96524f78a9407952494f872cc171349707
font_01_sfnt_off0000789b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789B 10036 bytes
SHA-256: 27a3b6ae9e7c3e6200b56691d57a96d52a73c828c3cd22f72b5233e460b7a510

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