Malicious PDF — malware analysis report

Static analysis result for SHA-256 328ccb2a9777a5ab…

MALICIOUS

PDF

43.4 KB Created: 2020-10-24 12:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 045e447e5e2bfaa625401f79ef0531c3 SHA-1: 39c68894119a454e8f30b8a65aadd4ed7218b4ed SHA-256: 328ccb2a9777a5abc57f16c2ffe3e3e338810db0245cc64a9d01f97e6bc0aeb3
154 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on link farm domains, suggesting a SEO poisoning or traffic redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://cctraff.ru/123?keyword=projet+d%2527assainissement+des+eaux+us%25C3%25A9es+pdf'. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://cctraff.ru/123?keyword=projet+d%2527assainissement+des+eaux+us%25C3%25A9es+pdf In PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/dinagu.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/rewig.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nowawi.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/7687fd57f3a2.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/4492718.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/nefugomezonilek.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/mokofigiwufezo.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/1/0432/0352/6820/files/linkedin_marketing_for_dummies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9641/9741/files/99650118817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6245/5191/files/tubal-cain_name_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7048/3349/files/thank_you_maam_theme_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/benefits_of_reinsurance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3141/8807/files/fesupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3901/1228/files/shadyside_arts_festival_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/73850721210.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/aminoglucosidos_farmacologia.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/bharathiyar_kavithaigal_in_tamil_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/jajaxuwosumimuzetirag.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/lodadu.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_off00006520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6520 5476 bytes
SHA-256: b1b552b4e97e3327615e6deb52b29e1c4a2d134986364f999fa53603a2669d58
font_01_sfnt_off00007779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 12424 bytes
SHA-256: bdd9ccdf918175fc5cb9367a112cdafff34ac1a2f52f4ca7028d1cf8038b5a22

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