Malicious PDF — malware analysis report

Static analysis result for SHA-256 316f514eea6fe654…

MALICIOUS

PDF

44.5 KB Created: 2020-11-06 01:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 00ae75339fd149c640a6921ef52dfd4e SHA-1: 95c577e47d3ba66b202bde153f0e4a10795e9121 SHA-256: 316f514eea6fe654dbcaf4726d84b79d582a614281f80db65c8610383aa09d8c
192 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, many pointing to disposable domains and redirector infrastructure, indicating a link farm or SEO manipulation scheme. One URL, 'https://traffine.ru/123?keyword=android+root+file+manager+apk', is explicitly flagged as malicious. The ML classifier also strongly indicated maliciousness, suggesting the document is designed to lure users to malicious content or potentially exploit vulnerabilities.

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?keyword=android+root+file+manager+apk In PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/bcb07.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/wisixovasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f9bc4ea4f9d9.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/19022656098b.pdfIn PDF document text
    • https://nutefowamedez.weebly.com/uploads/1/3/4/3/134330341/netiteb.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/revurepawogorakefi.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/4536698.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/3102600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f9b2ae6dd1d7.pdfIn PDF document text
    • https://lusekovipe.weebly.com/uploads/1/3/4/2/134234723/vitariputul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f91ab468fe2b.pdfIn PDF document text
    • https://zigifivabukom.weebly.com/uploads/1/3/4/4/134460242/sifenajix.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/6960081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f97c6b3d3771.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/gebaxovudofe/xoluguxererikuruxev.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/56048409566.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_off00006a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 5236 bytes
SHA-256: 50c50dbda8cc170336591edb7a27faefa07b0d4213bb60695812d906eeb34686
font_01_sfnt_off00007c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3D 11744 bytes
SHA-256: cbc6d4686aed3734b03a3e7fd5218129b031836254fbb221d6f6d91610b61c28

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