Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c54266530f60a9d…

MALICIOUS

PDF

63.3 KB Created: 2020-12-21 00:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a77ace233a58a0f2b1bfa2c4f7432c6 SHA-1: 1b947d035c9de8b4828aef12d43ab9fb49c3a330 SHA-256: 8c54266530f60a9def81fb11e1add534deed764739aa51243a0620f3965a00ca
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to "Microsoft point generator" and the authoring application, suggesting a lure for potentially fraudulent services. The presence of multiple external links, including one pointing to a known malicious redirector, indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or malware distribution.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=microsoft+point+genorater In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_5fd7ae43b5675.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/wumawage-xufug.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/verukimuduvuk.pdfIn PDF document text
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/471227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f89b7d8781a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fd9a451e5807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fb97c308cef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5fdfb6af8a81f.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/kaxukok/past_simple_grammar_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc304a32e34347c70520823/t/5fc51462e6d49a06bb33bde4/1606751334718/seven_half_bloods_shall_answer_the_call.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/nikon_camera_coolpix_l24_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/jereravuvemoluxanogu.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_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 5156 bytes
SHA-256: 9d72770656cf2e76ad4f3eb6294c8a67b5f51af09eb253075faef1642034827d
font_01_sfnt_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 10504 bytes
SHA-256: 222134eb88a81c4d06642884534a31eed46ce13bdccd93ac8265e948793d8076

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