Malicious PDF — malware analysis report

Static analysis result for SHA-256 909659437ef4f81e…

MALICIOUS

PDF

76.8 KB Created: 2020-11-18 07:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36dabecee4133fc818b048b159697cad SHA-1: 185fb00555ee2390e1febb3beb972e05c59e06d0 SHA-256: 909659437ef4f81e00f7bfe9899bd8d5f2438cf3b0ae6a9628325314a729abba
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or malware distribution attempt. The presence of numerous embedded URLs, including one pointing to known malicious infrastructure, strongly suggests the document's purpose is to lure users to external sites. While no scripts were extracted, the PDF structure and link farm are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=good+storage+for+gaming+pc
    • https://cdn-cms.f-static.net/uploads/4446924/normal_5fa84792eadef.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/f1566ba9.pdf
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/fefupuk.pdf
    • https://cdn-cms.f-static.net/uploads/4481403/normal_5fb464302b4c1.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5f93db7c12ae4.pdf
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f910df0b9d74.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5faac75b52e19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/purufiz/rilakubejagutobilo.pdf
    • https://uploads.strikinglycdn.com/files/ef8c0fd7-c7a1-4a8e-83c5-059037dadb68/bezuvud.pdf
    • https://uploads.strikinglycdn.com/files/b7f6b8a1-4991-4883-97b7-3844bd4ec512/14963477054.pdf
    • https://uploads.strikinglycdn.com/files/31ca5014-e9ea-4a3b-99e7-55fd5322312a/28426256227.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c6.bin
6b422421f1005b5b3429930212fb40e7c220b4d2c054eeab0ec9933780269d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 5260 bytes
font_01_sfnt_off0000f39a.bin
ccd10a5f92bc6b6ec9fc9b46b370f5a688555bffb08d778dc527c7786c78d3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10816 bytes
font_02_sfnt_off00011877.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 4324 bytes

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