Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3d30c2cb215297…

MALICIOUS

PDF

33.8 KB Created: 2020-10-30 21:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cd0fa8f3aa27d4d288ce2fb6590c1ddc SHA-1: d4c17b6bcf6829da042645d53b7d91f2b5f5303c SHA-256: 5d3d30c2cb215297488f6127e29f09f0c6a55d2dcd01c1dcf4cb22df33f17aa5
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=big+problem+little+problem In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f8a4cf3ae41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8e256899e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f8c680b0e298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f8f8ffec8ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5f96590e693aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f8f7236cd5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f8fdce786465.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/xugabuvovete.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/744d40eb-19e1-4956-8f43-ec0bb6c8f658/refizejekotaxamidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5936683f-ebf7-4ec3-b32e-0a7b8cf0c502/17739837449.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0760/6423/files/26414806983.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_off00004465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4465 4940 bytes
SHA-256: fe4f79a89ca98f2c137cd45202f298cf5dd59362a9441972c5b9824ddb3645d7
font_01_sfnt_off00005523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5523 10772 bytes
SHA-256: 6211e0225d402ee0e4ef1e37a2f961320bcb79e2d50f54401fe57e43130f0a76

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