Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c0a70d0f24d17…

MALICIOUS

PDF

39.6 KB Created: 2020-10-29 19:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb6e0eb827fb8c662c495dae9f405a2c SHA-1: 1de20604df487633dcd222adc17d2615dc9ef9d2 SHA-256: 836c0a70d0f24d173af7981a17b582734e6dd79e777982670873c98c41ff0f67
144 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://gettraff.ru/123?keyword=castle+rock+zip+line+coupon+code', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a callback lure heuristic further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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?keyword=castle+rock+zip+line+coupon+code In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/pimavo_nebixatipebad.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/e9cd3b45da40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f86ff977dd0b.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/vebufez_pedob.pdfIn PDF document text
    • https://narebojabow.weebly.com/uploads/1/3/4/2/134266185/4a37c1179de8e6.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/9243879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f8e122e7a2b9.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/a234f.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/poposapo-sevaka.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/jamokaroxoj/89999919758.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/65763940693.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_off00005b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B34 5088 bytes
SHA-256: e2ff3293a05d3bdace47a2a75a5a5476758cbbf4ecff4a44ec226452c91b1d3c
font_01_sfnt_off00006c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C91 10884 bytes
SHA-256: 25d3627e0e6951c86a6255133c2dffda134697f56d60d1f0f0fbeac979aa9c34

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