Malicious PDF — malware analysis report

Static analysis result for SHA-256 740a844fbf35d488…

MALICIOUS

PDF

61.1 KB Created: 2020-11-26 21:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f2ae39828ef25a1e39f3c607631cfd18 SHA-1: 9586573275300a77d80533da8c3604c0cb19d1d5 SHA-256: 740a844fbf35d4884e41f3fa6b2b34938b0df11806b59f9ca62d7ca6370fff63
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 0.9996

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://gettraff.ru/strik?utm_term=late+model+race+car+engine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fad430450381.pdfIn PDF document text
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/bb6575.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/kupiwukefimipig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5f94f888d2875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fba15b7dd727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fa9d158e304e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f89afee21856.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/5cc165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_5fae08a416e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fbdd7a0ee3e9.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/jopomodilamego/16859350401.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_off0000b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 5020 bytes
SHA-256: 1b7fa4f9cb087d1fc1e51a857f7e546fdb787e4894307d17aa0317383b963581
font_01_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 9408 bytes
SHA-256: 0a0371ef9098441eac28f7081165309082f80dd073894acffd938b6e47c805b7

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