Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b7eb0874e589bb…

MALICIOUS

PDF

46.0 KB Created: 2020-11-03 23:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba6f06d2a7ba47450e904e60bd1e3da SHA-1: 76fc155a8a567856df9c6e89d703661cf8e81233 SHA-256: e5b7eb0874e589bbd55d4001b1d66a703dd681c8f5cada934f5cc83b2d09225d
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though obfuscated, contains a URL that leads to a malicious redirector, suggesting the file is designed to lead users to malicious sites. The ML classifier also strongly indicated maliciousness.

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 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://ggtraff.ru/strik?keyword=talons+of+ire+and+ice+mhw
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f875d5fbd0e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20ce20a0-dc19-44fe-b74f-f874d7dd9117/human_impact_on_the_florida_everglades.pdf
    • https://s3.amazonaws.com/zijivevip/san_angelo_ymca_jobs.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/dynasty_warriors_4_horse_guide.pdf
    • https://s3.amazonaws.com/kitakilesa/ignou_registration_form.pdf
    • https://s3.amazonaws.com/bojafazes/bubawuwoliwuronidawemexu.pdf
    • https://s3.amazonaws.com/wonoti/zinedatagufipetiwakinaz.pdf
    • https://uploads.strikinglycdn.com/files/677504c6-b2ea-410e-a0a7-205bc75a59a7/medosir.pdf
    • https://uploads.strikinglycdn.com/files/fc138d2a-5bab-4177-b365-98a180651aac/xamutinajeten.pdf
    • https://uploads.strikinglycdn.com/files/273e6c9c-12dc-47a2-9bae-db1a7b0995e3/jajadetemozodomuxodadasup.pdf
    • https://uploads.strikinglycdn.com/files/9c3ede13-0a92-4131-b906-c0e642b460e9/frog_street._portal.pdf
    • https://uploads.strikinglycdn.com/files/83bc427a-42f4-4d89-9fe4-95a3af9d578a/tahar_ben_jelloun.pdf
    • https://uploads.strikinglycdn.com/files/c159f836-f915-411d-8a15-8120ce7ede7c/rofuwej.pdf
    • https://uploads.strikinglycdn.com/files/9b0de54e-81bc-40d2-bd1e-264d0556084f/24580720560.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000718e.bin
490d7b71b8a57ba0ed8f452e205214385553f5658c073436735be9df00872434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 5304 bytes
font_01_sfnt_off0000837b.bin
81138d97f303b3a6d91ca87cc5834262b5a62c9ef82cd451de3c633284a7b3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837B 12568 bytes

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