Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79b8457f7f4b8e7…

MALICIOUS

PDF

41.3 KB Created: 2020-11-02 11:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb89d1fd57b4de3b2f5583d7fb74a976 SHA-1: 21755be179c0d382a510e2d1e6dc2b9bfc95a14e SHA-256: b79b8457f7f4b8e71659c961342f4cfa54c9b758e9f6f7531e19bb22ed879e6f
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.me/123?keyword=2019+the+joker+subtitle+movie+free+online In PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/1059704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f9cf6e3bc5ed.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/revowo-mutitikiva-wiwegovinajo-tuxatusejuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5f9ec87ad6cd9.pdfIn PDF document text
    • https://takoxoja.weebly.com/uploads/1/3/4/3/134371043/5f4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f9d39a06e882.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/ed00dae7a59.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/tesodagiwor/system_design_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/lifeziro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2022/5176/files/class_10_statistics_ncert_solutions_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/analysis_of_variance_scheff.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/rubefapokamexeles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9510/6750/files/33259302304.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_off00005c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6B 5524 bytes
SHA-256: 91f0c2ea30c3e26462c8b0de7280265bc5563311623d72b887221196cf0733a5
font_01_sfnt_off00006f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1A 13224 bytes
SHA-256: 94c3035506d848d701666e5ba2cea4f77157612224b0a15cfe670cf46e12dcaa

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