Malicious PDF — malware analysis report

Static analysis result for SHA-256 660535d6058eea1d…

MALICIOUS

PDF

33.3 KB Created: 2020-10-30 08:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 29e0fdbc2f1d2bc59af77e7179467634 SHA-1: 47acf092ebd8aaa44fe02e4dd8151b64c1544853 SHA-256: 660535d6058eea1d5f2b2821135426e7481cbc83486adbb120a25ffd2a040279
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/123?keyword=delta+unisaw+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f88c7f0e45ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f8cfcee1ad29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5f9ba299c53f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5f8fa4dd5808c.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/9562653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f8faae564ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f9670e7eb83a.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/mosunodelilinubopab.pdfIn PDF document text
    • https://gemiwanot.weebly.com/uploads/1/3/4/4/134495393/6005878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8c19307dc38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f953a2eec782.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/04609804.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/fezenur/tijizolosilope.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/emerson_nature_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/ncert_biology_book_class_10_download.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_off0000464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x464A 4824 bytes
SHA-256: a839c6a6de2b58decac06daddcbbfb66633273cf13ff95b4c47441a2d6bdb4d0
font_01_sfnt_off000056bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56BF 9836 bytes
SHA-256: 74ddaf5e07cee4cf080e1c544d19301a55c6e1cc9c9a9d681b837ff3dc1e52c9

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