Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda0eea21871216a…

MALICIOUS

PDF

41.5 KB Created: 2020-11-07 03:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a15058e38db19f5b18bb74019ff98436 SHA-1: dfcc4f4487fbcfa0cd29efa475ba1fd8d3f4b69e SHA-256: dda0eea21871216ac7ab75c0487a7a2d2ca1bc7b08303e18da6042df065ff042
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://ggtraff.ru/123?keyword=valerie+landsburg+s+brother+michael+landsburg In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_5fa05433025e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8f5b7b18515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f99276b422bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f94245f85716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rejepepari.files.wordpress.com/2020/11/easy_rock_piano_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/fran_summoners_war_runes.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/mavifelamebejit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26d6577-dfc6-4700-a4a0-1153eaadd0b8/13880984429.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/shredding_diet_meal_plan_female.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/48417046575.pdfIn PDF document text
    • https://xumozaguk.files.wordpress.com/2020/11/rewufixekuserutomikuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/35503858736.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/saint_benedict_prayer.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_off000062d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 5460 bytes
SHA-256: f1a87590e0a5319832587cc5e1d690b2474ce9199780ea5305886029b92845ce
font_01_sfnt_off0000753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 10540 bytes
SHA-256: e08feb70c47a05ef75b2a101c8efbf12fd7e00c597a5835de58c2bc8a4cc219d

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