Malicious PDF — malware analysis report

Static analysis result for SHA-256 644bbaf91baf1ee3…

MALICIOUS

PDF

41.1 KB Created: 2020-10-05 18:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 261d868ce15651709694cd3f6dd8522d SHA-1: d740139292364e34e718bfcab37635d90f63b52f SHA-256: 644bbaf91baf1ee3ca3bde1e491b12a446c88546a2b2d55509f94a5e4225fca7
184 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, which is designed to lead users to potentially harmful websites. The document also functions as a link farm, hosting numerous external PDF links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of malicious links and the link farm structure strongly indicate a phishing or content-luring attack.

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://cctraff.ru/strik?keyword=poetry+rhyme+scheme+practice In PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/godakitovojinegivodosadi.pdfIn PDF document text
    • https://site-1041286.mozfiles.com/files/1041286/56187503140.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/36496070371.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/lopofoterifikibisimogi.pdfIn PDF document text
    • http://files.debbiebonello.com/uploads/1/3/1/4/131406656/kusun_mixet_xibamulatubi.pdfIn PDF document text
    • http://kebar.nowforyoga.com/uploads/1/3/1/4/131438562/d2bf65c89216.pdfIn PDF document text
    • http://biwejuda.bridgeportrodandgunny.com/uploads/1/3/2/6/132681144/belelidegiwe.pdfIn PDF document text
    • http://jaxulon.buildvaluehere.com/uploads/1/3/1/8/131856166/c7084b.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/1/0433/7251/1386/files/34678484632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5980/0983/files/podod.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_off00006528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5244 bytes
SHA-256: 1346392033e4c224f8b345ba5595d6256b1863da8e5d4a7d9562d49aae15b648
font_01_sfnt_off000076d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 9580 bytes
SHA-256: c61c648e745731b490025f68d449ef0580f3b88bff6d5fbd4741ca785b767c70

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