Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a968fa04637997e…

MALICIOUS

PDF

47.6 KB Created: 2020-08-25 08:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2639d9d3e85eb7e8e8a58c87f3e6fe20 SHA-1: 5fca38bc4cff7e3d1b740cae426eed88b554a3e2 SHA-256: 3a968fa04637997e92939e7e5cb086fd3b22dfe47f88ba9133fe11b183760d16
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=area+of+2d+shapes+gcse+worksheet', which is the primary indicator of malicious intent. This suggests the document is designed to trick users into visiting a malicious site, likely for phishing or malware distribution.

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.cc/pify?keyword=area+of+2d+shapes+gcse+worksheet
    • http://dugozejo.newstarwealth.com/uploads/1/3/1/8/131871864/849437.pdf
    • http://files.natcheztemple.org/uploads/1/3/1/6/131606349/jefakonowulolos.pdf
    • http://files.desirapesta.us/uploads/1/3/2/3/132302924/6318279.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/psychology_trivia_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/lujowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/itunes_country_codes.pdf
    • https://cdn.shopify.com/s/files/1/0459/9962/0263/files/siop_lesson_plan_template_3_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/17921916694.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/zafex.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/secured_unlock_adobe_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/22177863767.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_off0000708c.bin
f646356e6159d768b72e6e2dfc3fa477b18d09223b3008b5d1560d13fd4b217b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 5664 bytes
font_01_sfnt_off000083e1.bin
0f9f0c603d5c06ea323032b369fb610e9fb7a0b41e9d8c83467df03aaf752e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 14356 bytes

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