Malicious PDF — malware analysis report

Static analysis result for SHA-256 5017829bce137cc8…

MALICIOUS

PDF

42.0 KB Created: 2020-10-02 12:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 19a91a927fd7d7686ed277e87817ded4 SHA-1: e0ebf5b5bbb5857249545bf6004eecbfd4ccf676 SHA-256: 5017829bce137cc808a1d327a81320210073223ed63d6d56630651dca2016d66
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to distribute malicious content. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of numerous links to PDF files, many of which are likely malicious, suggests a phishing or malware distribution scheme.

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://cctraff.ru/strik?keyword=environmental+science+a+global+concern+13th+edition+pdf+free+download In PDF document text
    • http://files.ubiquityleadership.com/uploads/1/3/1/6/131607331/b1bee0d81.pdfIn PDF document text
    • http://files.bendnaforums.org/uploads/1/3/0/8/130874285/e59111afb.pdfIn PDF document text
    • http://files.topproductcomparisons.com/uploads/1/3/1/1/131163533/8618433.pdfIn PDF document text
    • http://files.greenkordofan.com/uploads/1/3/2/6/132695531/7572745.pdfIn PDF document text
    • http://kilixeri.drnicolemjones.com/uploads/1/3/1/4/131483154/vukibogakomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4440/7976/files/158152739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/cal_poly_slo_business_majors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/20004483718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/life_cycle_of_a_spider_monkey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/kovagusasen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/chemistry_a_study_of_matter_worksheet_answers_9.13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/el_triangulo_de_las_bermudas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1014/5694/files/ktm_dirt_bikes_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5785 5824 bytes
SHA-256: 70e183430c08429e39746ea79eaca756a40cf585f59d40f96558c8d6917ef013
font_01_sfnt_off00006b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 9808 bytes
SHA-256: 33c7a9021e9d64d3d579cb8c14cbbc0ab20b6a9844188b6017b9cf8c2d67ff8c
font_02_sfnt_off00008ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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