Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe25ca96ada6471…

MALICIOUS

PDF

56.2 KB Created: 2020-11-04 03:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b63d979d4e79282686330a6b38483831 SHA-1: 2bb040b07caff6109f9e7c64283ca47179c56cb9 SHA-256: dfe25ca96ada647169f49cccef7a37283e02ba522894e4302694373a0549af79
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDFs hosted on disposable domains, a technique often used for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body is heavily obfuscated and contains what appears to be junk data, but also includes the URL 'https://ggtraff.ru/aws?keyword=1+syllable+words+that+start+with+h', which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=1+syllable+words+that+start+with+h In PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/1bf7a66e4791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f90ff2fa2b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5f8ad026b684f.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/jafebozade.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/gasodewuwuw_vewaruwejes_biwusepawuwolek.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/9648860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_5f9c387925f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f96e7f4634a4.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/pobulex.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/jevekaviw.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/3174677.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/letiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/392f56ab-a3bf-48e7-b948-c4de099a0be5/19129532778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ede0b5c-8bfc-43d8-a066-5342d52a2a6e/ketipevewewameb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3af7dc0-f59b-481e-a3b3-63caee7a41e5/20525811364.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_off000096b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96B1 5204 bytes
SHA-256: eccec3b557395731c026775caa5db4291dec8adb6a820acff8305704ab491afa
font_01_sfnt_off0000a86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA86E 12944 bytes
SHA-256: 7d5e9491e8891f63b588ee5b173fc5b003fbc6a8ee5c381658d207b3de045390

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