Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da466cc69a0ab92…

MALICIOUS

PDF

77.8 KB Created: 2020-10-27 16:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d34f7c7d16f834deed156183f6c82c90 SHA-1: e19e06f59a6c6a794076be7d4c1a46fe54b067a0 SHA-256: 4da466cc69a0ab92d68d9ffb8ffe12446f57ea0273f0fc8dd929c2f03f80da0a
162 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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/123?keyword=chapter+5+section+1+assessment+world+history+answers'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, suggesting a SEO poisoning or traffic generation scheme. The presence of a 'Download button' lure further supports a malicious intent to trick users into navigating to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.me/123?keyword=chapter+5+section+1+assessment+world+history+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f94ad4140d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f86f4252feb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f89ce300ed9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f9569e35cc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f92b61862318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2777/1804/files/work_manager_android_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2477/6857/files/mivojotuluwejiguded.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/temoxuxovemagenurux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7440/3480/files/54354404662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2154/7713/files/pudelule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1282/5503/files/dexijanafoluzonimige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/biology_accelerated_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/xebejesisubejafomamadaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/csir_bursary_2020_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8960/6838/files/normal_good_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7973/9813/files/60628315748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5855/9656/files/6399837508.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5588 bytes
SHA-256: 5be0cd7c8b4e86af95988204394a72e295abcca0175a9326692244d3311560ce
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10940 bytes
SHA-256: f21c14fb49e0e7769ec9d73b70bb1b9c53b863700122a9af09760243123877b0

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