Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670a1601b22aa80…

MALICIOUS

PDF

37.9 KB Created: 2020-07-29 06:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 465d35468d7193bb9161e2a38c3ef7e4 SHA-1: ce98bfcf7e9d378bd8573a98952c7a4bf522d9ca SHA-256: 7670a1601b22aa807a03d6f73eceebe9d6a5f259d042f15f3414d21960547ed9
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document's content, though heavily obfuscated, appears to be a lure related to business reports, likely intended to trick users into visiting malicious sites. The presence of numerous links and the ML classifier's high confidence score 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://ttraff.ru/pify?keyword=dun+and+bradstreet+report+uk
    • http://files.lawncarenewburgh.com/uploads/1/3/1/3/131380339/nugajososikupovepam.pdf
    • http://files.freehandsilversmithco.com/uploads/1/3/0/8/130813736/wikerofepemepis_fadunenivaz_safeta_dizamugepivigej.pdf
    • http://files.crossharmony.com/uploads/1/3/1/4/131453648/e192330ba6d7c65.pdf
    • http://files.randengineering.ca/uploads/1/3/0/9/130969746/c157793fd9e.pdf
    • http://files.artmusicden.com/uploads/1/3/1/0/131069978/d23e2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/kizanunaziguwaseku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/88519214453.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/retobapaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/bijarunerixoxigexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/91800757770.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/dunetapiri.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/10669911102.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/83878601370.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/74830002384.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/92661598735.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/52456585687.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/sazirerilajufebaworodozus.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d8.bin
40723015b4ef61273f2d74c984452d7188335d8c65e9d0d8c26076836a061a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D8 4956 bytes
font_01_sfnt_off000068b5.bin
53567e74f718610f2369a9a7d5dfe56a276576bc4ecb4bec4b1c77612bf7d2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 9924 bytes

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