Malicious PDF — malware analysis report

Static analysis result for SHA-256 633f557e0d2bda1d…

MALICIOUS

PDF

66.2 KB Created: 2020-11-24 10:34:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b306db57ac881d7089cc0b79ed949051 SHA-1: 128824e834c8f3617e896afa27d302e130aefc62 SHA-256: 633f557e0d2bda1d774be233f5fe1209db1d3cb6795ed3831f84658ad3ed065e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were extracted, the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=watch+the+joker+hulu
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f9068b65460f.pdf
    • https://cdn-cms.f-static.net/uploads/4489844/normal_5fb44f9d666a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d3eba10-2bc3-42d4-a376-b00047cbf58d/92434534639.pdf
    • https://s3.amazonaws.com/popagexexoza/tibepopajopekix.pdf
    • https://s3.amazonaws.com/temujonuwu/columbia_heights_high_school_mn.pdf
    • https://uploads.strikinglycdn.com/files/f069a40e-18ac-4378-9d85-60b86f292e3b/de_esquema_de_tabuleiro_transmissor.pdf
    • https://s3.amazonaws.com/felasorarabipis/abbreviation_for_officer_in_charge.pdf
    • https://uploads.strikinglycdn.com/files/9cba4954-b872-4bd5-aeed-219316505a2b/41068318337.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/cannibal_ferox_full_movies.pdf
    • https://s3.amazonaws.com/murudute/riwupewikunorigidisu.pdf
    • https://uploads.strikinglycdn.com/files/ec8b567e-a229-4b5d-b186-884e2bf2a435/29930815452.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_off0000c412.bin
2f80af50b5b7d6b8475eaade73003234811dfc762e398425cc3fba12d4d2496b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 4860 bytes
font_01_sfnt_off0000d4a6.bin
3333ed0ba024be1bbf8cde111c6a1aff5fb2075378bf05857bde40a058c10a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 11524 bytes

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