Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd88ea9e3811db24…

MALICIOUS

PDF

43.4 KB Created: 2020-11-07 10:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 948e2ea67b36800201af2a3c78f72569 SHA-1: b8f2c2af8e385219ba480e11e759da09db21eed7 SHA-256: dd88ea9e3811db240bced86e4483147c06c842b352d341ef2cc053f2024bbb51
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, containing numerous embedded URLs pointing to external sites. One critical finding is a link to known malicious redirector infrastructure, specifically 'https://traffmen.ru/123?keyword=free+light+o+rama+sequences+16'. The document also hosts a large number of links on disposable hosting, suggesting an attempt at SEO manipulation or distribution of further malicious 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.
  • 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://traffmen.ru/123?keyword=free+light+o+rama+sequences+16 In PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/bunovumuvule_piwal_jojerebofabevek.pdfIn PDF document text
    • https://viwijivawapel.weebly.com/uploads/1/3/4/4/134492302/dizibavutenuwiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_5f9e339fce3f1.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/d0bf886a5.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/9586068.pdfIn PDF document text
    • https://fozufamegevavup.weebly.com/uploads/1/3/4/5/134586639/matepitasodeviz.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/32f1e16000bb.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/4d610cc.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/funotijofe.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/tisaxuwabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f9558329b86d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tunobomuxi.files.wordpress.com/2020/11/xadatotunamevin.pdfIn PDF document text
    • https://wopuxipimupa.files.wordpress.com/2020/11/22652206605.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_off00006a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 5500 bytes
SHA-256: 3f9ad5ee6c1152bbe29671a76dd80ce95dd08c52b0a093d057cb59a7c5ac77c8
font_01_sfnt_off00007d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D16 10312 bytes
SHA-256: 9801be9771c072891c2c922e3de65e3826d45e4aa6b4e8577beb4f6dcf1f7c13

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