Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8402decd4e75bf4…

MALICIOUS

PDF

47.9 KB Created: 2020-11-02 10:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1a98e6e85526306d04fb4be2bd4df47d SHA-1: 5afb884894c88f6fe7c81044966e415bfed3c430 SHA-256: a8402decd4e75bf40e7f3fa4e8f7495469b59a49bb5035022eef5ef64069d560
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://cctraff.ru/strik?keyword=spongebob+squarepants+games+unblocked In PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/mafiw-mirijodopapemib-lebixi.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/6080273.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://s3.amazonaws.com/vuforewebub/76074135406.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/banesesomafa.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/jones_company_is_considering_changing_its_capital_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9951987b-b264-4a68-87cb-29ef15155255/nadopuwazofajen.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/root_canal_retreatment_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/19435249528.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/47865602576.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/zuxenered.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_off00006d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 5660 bytes
SHA-256: 2bf919c0a535db01d6029fbd22f1fe03637ace7e22928fbfd84929c7deb8081c
font_01_sfnt_off00008055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8055 10512 bytes
SHA-256: e96a3cd22f3bbe4acf60fd9768c7c0633b07ec46ce94952541a2570fd882920c
font_02_sfnt_off0000a457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA457 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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