Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fbe791a848ae1d…

MALICIOUS

PDF

39.5 KB Created: 2020-11-05 13:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 11007b8182800b59176e723a94a4861f SHA-1: d42057c819d8faac92817d322ebd3dac52d69c94 SHA-256: 91fbe791a848ae1d3ce864c65e48007808a849bff580ccfe2ae089633f9bc142
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.link/123?keyword=us+food+items+made+in+china In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f91fa661c096.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/b6adc00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f8fdba8b51ec.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/veboxinogobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5fa0bae78b3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8a9a1219d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5fa374c2486b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5f98e98d07723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f95d3b0bc10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9d4fa93e90e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 5124 bytes
SHA-256: 452254efb21dd26b72ffac2616e2a8620ddc1d6064ab79fc006f79cb201f9a67
font_01_sfnt_off00006e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 10368 bytes
SHA-256: af6a42661af2d27f5271e2f9af4e01bae08194bf86cb5d0a125ff260804d5134

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