Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b530bc4bc4cbe9…

MALICIOUS

PDF

46.5 KB Created: 2020-10-05 18:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55a15856c2651f5e0b6621ed2633b4ae SHA-1: 7f39b42ca141e8699f1f34dfb616aa8cdcd5164f SHA-256: 88b530bc4bc4cbe9e595ac1182c7cd410b7e30ab9849f86ff9e4b88565ae88bb
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic generation. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings indicate a malicious intent to redirect users to potentially harmful 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/strik?keyword=modele+de+lettre+au+procureur In PDF document text
    • http://files.pscandi.com/uploads/1/3/2/6/132681409/libomari_widawatudesa_mamepedu_wijug.pdfIn PDF document text
    • http://files.surprisedbypurpose.com/uploads/1/3/2/6/132681771/32862.pdfIn PDF document text
    • http://files.micaylairmiter.com/uploads/1/3/1/4/131438708/bd84837.pdfIn PDF document text
    • http://fopom.bridgeportcf.org/uploads/1/3/1/8/131871787/1802088.pdfIn PDF document text
    • http://fosugax.poiseaussies.com/uploads/1/3/0/7/130738615/wufoj.pdfIn PDF document text
    • http://files.ef-art.net/uploads/1/3/0/8/130873790/vesori_xapemof_mabewejepebukez.pdfIn PDF document text
    • http://jaragisag.commonactionfreeschool.org/uploads/1/3/1/4/131438563/6301981.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/1/0434/5397/2630/files/delta_bench_band_saw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0341/5208/files/blushing_bride_drink_with_vodka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1840/1430/files/jobexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5561/4625/files/sazawifilivotorebinuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/the_raven_annotation_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8624/4757/files/willard_bay_camping_cost.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1320/0808/files/45288913799.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_off00007405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 4896 bytes
SHA-256: f70a866ee1fc3bf692acc7a5e1eb82be1097063fc136329c291e5ce2a06788fc
font_01_sfnt_off000084c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C4 12260 bytes
SHA-256: da996daa10a8d638694bb468533efc6fb365a24b75aaff48f74438c231fc240a

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