Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e4255b3db98d62…

MALICIOUS

PDF

45.8 KB Created: 2020-10-31 12:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 67451a206db3214eb393f3d3dcc300b8 SHA-1: ef8de8da6279d8a7019488d480b8e201b32b0136 SHA-256: 75e4255b3db98d62e12e78575a6b9569dd4f63c10f1ffea11f4e51409a0e05a6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to suspicious or unknown domains, indicating a link farm or redirector strategy. The ML classifier strongly flagged this PDF as malicious. The embedded links, such as 'https://ggtraff.ru/aws?keyword=functions+and+graphs+worksheet', are likely intended to direct users to malicious content or phishing sites.

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://ggtraff.ru/aws?keyword=functions+and+graphs+worksheet In PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/rojafetibawisuz.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/1694434.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/wakenafo_vurebusej_metedorakeru_runuseteni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f8d67e6a6e20.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/8731345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f8ed539d3f54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0739/1920/files/android_tv_box_not_connecting_to_ethernet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6298/3363/files/noduleranawaxiwipozixabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5799/8743/files/80824735161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7590/8795/files/crohns_disease_pathophysiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6573/6853/files/62259667319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4325/3152/files/rumurogup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07338d45-407a-4d99-8828-52fad9841c1d/direct_hire_meaning_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0494/3295/files/90505918404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5057586-859b-4b87-ba7f-367c2ad2c50d/59138747137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1254/5469/files/fesukefir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000655c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655C 5296 bytes
SHA-256: df51d782683353c59c21d71e014479a5170e3f0a207cc717bba1917d2a81d77a
font_01_sfnt_off00007766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 10900 bytes
SHA-256: aeee68d10ac4e98122065b15f344c20c86dc068192402a2d10b38041b0d26d50
font_02_sfnt_off00009bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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