Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcad221f6bb3a4b…

MALICIOUS

PDF

38.7 KB Created: 2020-11-04 05:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8f1d02e05dbe2bcfb820e0e4bdc3bd26 SHA-1: 53905a3650737b8a197aa95d16dd9403c0e9e8bf SHA-256: 4bcad221f6bb3a4b9bc7988bcebc601fbaf043974245b1cc2100cfc526719974
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=obb+downloader+apk In PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/e0cdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f87433573664.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/netuxeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f87a85988740.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/dogazisuze/91381953224.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/the_neophyte_s_guide_to_scala_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/foris.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/30881186516.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/buddhism_for_dummies.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_off0000598d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598D 5100 bytes
SHA-256: 7aa905c8190bb5058bfc4409508e986d66560b236c36b23d535f66f36f390bc3
font_01_sfnt_off00006afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 10576 bytes
SHA-256: d280ae76a82e4ac832a12068ad8489088a620b575ae167b0a25cf9f7573f5797

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