Malicious PDF — malware analysis report

Static analysis result for SHA-256 1225fec66ee614e5…

MALICIOUS

PDF

41.5 KB Created: 2020-08-13 08:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11e13fc80bd0017397f328f15b478b24 SHA-1: d18cdb53b4aecba2b596e0737021cb82af319ecf SHA-256: 1225fec66ee614e5d8faded6baa6a6b68656fbae7917dface45315ed4a4cd0a8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'workshop manual' and includes the malicious URL, suggesting a lure. The presence of many external PDF links points towards SEO spam or a link farm, potentially leading to further malicious content or phishing sites.

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/wb?keyword=piaggio%20zip%2050%20workshop%20manual
    • http://poxasu.lieberconsulting.com/uploads/1/3/0/7/130776167/5cc9a89ee5aaa41.pdf
    • http://files.cameronmarketing.com/uploads/1/3/1/3/131379266/5838389.pdf
    • http://files.wapropestcontrol.com/uploads/1/3/0/8/130873872/timenus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/winebotiruwarezawemamibuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/65480577949.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/xinupawigof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/63714604341.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/eenadu_news_paper_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/zukozanijuvumalufixa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/10451935995.pdf
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/nfpa_15.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/nicomachean_ethics_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/57438666111.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5207/files/business_communication_process_and_product_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/85887941228.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_off00005a34.bin
76b9a673f1af17f0fb57ea16f90d0b40414899fecfd65b03bb634e14ded31952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A34 5704 bytes
font_01_sfnt_off00006d8e.bin
f8f43138d8825aeab00566420e7d4a0963ce002f4e5a66ee63c7ff45333aba5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8E 14048 bytes

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