Malicious PDF — malware analysis report

Static analysis result for SHA-256 827e264357437e9e…

MALICIOUS

PDF

62.1 KB Created: 2020-08-28 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e332ba51882d14f5e63f99e44b5fd8af SHA-1: f0fe6cfe5010557f5ca893c66e5a9c077a8f1ac2 SHA-256: 827e264357437e9eae0b2cd17c773629b0689a86765c98a3808e8092eff901fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru, suggesting a phishing or scam lure. The document body text, while partially obfuscated, includes the target URL and a reference to a legal article, likely intended to trick the user into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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://ttraff.ru/pify?keyword=articulo+477+ley+federal+del+trabajo
    • http://files.bradbstevens.com/uploads/1/3/2/6/132696067/gepulu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/85206425253.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/moxudipozipoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/41374248279.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/39128155516.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/11826307798.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musigusuwekun.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/report_on_road_accident_you_have_witnessed.pdf
    • https://cdn.shopify.com/s/files/1/0434/3667/1132/files/oxford_bookworms_stage_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/67922745505.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/cenas_saludables_para_bajar_de_peso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5bb.bin
bc0aa57f3b5826e965eb43dcefdc727ec1e6f7afa669b7a1b7d13851e79a8dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 5312 bytes
font_01_sfnt_off0000c7f4.bin
31b3735e9ac97fd3ebd644c71fb396b2c31de5f2944d1a440d31a67a6019043b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 11172 bytes

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