Malicious PDF — malware analysis report

Static analysis result for SHA-256 48425db99d5eb656…

MALICIOUS

PDF

41.1 KB Created: 2020-11-08 17:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 206dd5360f61960edea06dc8bcbf1770 SHA-1: 1197f11372e871dd1a837a029b5b30c3c3d1aceb SHA-256: 48425db99d5eb656ffeca4bbfbffe007f879baabe8db3ee5de08dea025f4f42c
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://traffmen.ru/123?keyword=play+store+app+apk+download+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8a0d0cde8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fa0704baae8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f884866a4144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f9189a61cd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f870cddb533c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://povojoboxep.files.wordpress.com/2020/11/48117456878.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pobiwitu.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/jopupuridadaropanawogubil.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/kivuworizi.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/bellaire_high_school_language_aptitude_test.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_off00006322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 5328 bytes
SHA-256: b9b77b026dfa9b2dc9eaa710f278d51a97699fe3829085394c1117a3643cedc7
font_01_sfnt_off00007569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7569 10228 bytes
SHA-256: 39d82a4a00061664b9fc5a44a38ebc8915d3633d968e5624bc68c844e64ce593

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