Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5b765697b2e58…

MALICIOUS

PDF

68.6 KB Created: 2020-12-31 11:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: afb7a5a2acaabed5b58cbd505624ef9e SHA-1: ef02202616a052efaad6afbdea4dbeed8e835d90 SHA-256: 4fb5b765697b2e585b8d1cb05f731c3f65f89f43b75c2fc8d444da5321cbbdce
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm and a malicious redirector, indicating an attempt to lead users to harmful websites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, including one to a known malicious redirector, suggests a campaign to distribute malware or phishing content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user lures.

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.
  • 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://traffmen.ru/123?utm_term=no+vudu+code+on+walmart+receipt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_5fc01fe2afa19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fe7ed4964b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f9b92ed72665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_5fdb2e6985c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f9a83bcb5ae2.pdfIn PDF document text
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/9333893.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/jcDJfhb/coming_down_the_mountain_lyrics_jane_s_addiction.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/hdAWtwv/girosobus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8d34cf041f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fa4434d1c162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fadc7945acc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_5fda1d2e4d58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_5f9a12a83693f.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/rudelazifizuvo/dhtml_ka_full_form.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_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 5160 bytes
SHA-256: 39fb92443a578622121555b7ac5dfe1ee18acd545024bfbecf073730cee239cf
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10388 bytes
SHA-256: 58e618d0eb307b0d4c89bdc17c5f0007e82a4885d33cb16d01087fd6b97c8dc7

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