Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb73bd05b25fe66…

MALICIOUS

PDF

39.3 KB Created: 2020-04-03 16:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-07-24
MD5: 1afcd1c86a0430452d24b2b6403dffac SHA-1: edf68a43c6af8499b2586fe517dd657755af1ba6 SHA-256: bfb73bd05b25fe66913d737d6b6c5a44b2cd4a06583a3f8a14a74b606de7b34d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of numerous SEO-like URLs suggests an attempt to drive traffic to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://yerbasherpa.com/uploads/1/3/0/7/130740202/130740202.html#thehunter+call+of+the+wild+leveling+guide PDF link annotation
    • http://cordivanoapparel.com/uploads/1/3/0/5/130545278/gafokukubajedek.pdfIn PDF document text
    • http://anewconversation.com/uploads/1/3/0/2/130289332/2677882.pdfIn PDF document text
    • http://chamberlain.partners/uploads/1/3/0/2/130291699/defbbe85d6.pdfIn PDF document text
    • http://youcanbepregnant.com/uploads/1/3/0/5/130543995/d2a35a9.pdfIn PDF document text
    • http://priscilla-l-rodriguez.com/uploads/1/3/0/3/130323131/xirewegotowosagutid.pdfIn PDF document text
    • http://bebeautifuldesign.com/uploads/1/3/0/8/130873730/datuwobu-pivivobelos-zabipujonizaguj.pdfIn PDF document text
    • http://alaskarvcamping.com/uploads/1/3/0/3/130313166/govatoxuzatetunaki.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
🗂 Part of campaign: aceintheholeentertainment.com 5 samples

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7070 8384 bytes
SHA-256: d9e16daca83fc9cd7c83fcbdf1a5d9e51ba6b0a18e2a63e16ac5430f1f9007c1

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