Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b7f8780d2a39c…

MALICIOUS

PDF

50.8 KB Created: 2020-10-28 17:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dd4841fb2e390b191c1adbf3b2983069 SHA-1: dd11f6f0915a495228f07820a316d9ac6aa3c727 SHA-256: d21b7f8780d2a39c7f93a99bb95e0641272ec0ba5149c464d3cba95edfa42234
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially harmful websites.

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=barbarian+5e+totem+homebrew In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/dipuxafokovusesa.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/bf4044576.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/694e642b209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8999c56318e.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/bbf935c44711.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5f8cece9ec3ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8d4e1d5d6a8.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4462184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f972b8fadc12.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/9754e2b283ca.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/4fcf7b50e.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/gebaxovudofe/aiche_2020_abstract.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/nepanuvofifuxudojeri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/4712/1573/files/toyota_celica_manual_transmission_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/canada_map_outline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1546/1285/files/gizarulotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6010/0765/files/zomafozulomoxobat.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/advanced_excel_tutorial_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/spoken_english_skills.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_off00007b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 4908 bytes
SHA-256: ee3626dd5a6c71cc914db229cf36d5fa3c7dc44cf17377a8040b97a42a162ad3
font_01_sfnt_off00008bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFF 10444 bytes
SHA-256: 666b8a8c37beb24b8f2521baddf8332cbe076df967aa5b8f6dadaa601eff990d
font_02_sfnt_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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