Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec33cbae9080135…

MALICIOUS

PDF

68.4 KB Created: 2021-01-10 21:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 480128988af1a4bb3684ccd6dac54b61 SHA-1: b99781d611b8c0e1d3a28095108c30d2b171eacd SHA-256: 2ec33cbae9080135aed95d6a80d46ac280a0ae597ae695710557eb83b1bad667
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including the use of repeated invisible links and redirectors pointing to suspicious URLs like 'https://gettraff.ru/123?utm_term=rocket+mortgage+squarespace.com'. The heuristic firings strongly suggest a phishing or malware distribution attempt, leveraging a link farm to obscure the ultimate destination. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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=rocket+mortgage+squarespace.com In PDF document text
    • https://cdn.sqhk.co/rajunakeb/Evgshak/realtime_subscriber_count_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/iaUiiqk/happy_clinic_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8e49968a074.pdfIn PDF document text
    • https://cdn.sqhk.co/venujotiwufo/gehchcw/29540990656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe454ded672a.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/TEOigmc/building_services_group_ltd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fc96a38c5a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fbf07bfe0bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5faaa42ee2b45.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/7542820.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ZojjHji/57557439908.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/e9246.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/iR8tihE/93585856943.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/rujabepifar/37998607885.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/insert_calendar_in_word.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_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 5452 bytes
SHA-256: ebabe0b38f30854bbc99e992fd783a47d66ce3b7c979ec964f5ea5d344b309d5
font_01_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10860 bytes
SHA-256: 768deb28976c29dd675158a0b6a4fe06b4c7b30d87c873a013d5ff66b14bde16

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