Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d5840c2b8d507c…

MALICIOUS

PDF

36.1 KB Created: 2020-08-11 02:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a7c964a7bc10330c4fd1601d6c6671 SHA-1: 9e2507f896195a6ea879b4d9475bb3d2a882c351 SHA-256: e8d5840c2b8d507c8f78f40b092b6fe8d1631b0a2dbad5f8e8070040fa988bb3
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'vocabulary worksheets pdf' and the malicious URL itself, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports 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/wb?keyword=places%20at%20school%20vocabulary%20worksheets%20pdf
    • http://files.maryfarrfineart.com/uploads/1/3/2/7/132740618/8611424.pdf
    • http://files.williambouman.com/uploads/1/3/0/8/130874359/c240b.pdf
    • http://valulaje.walkonthewyoside.com/uploads/1/3/0/7/130775795/435898.pdf
    • http://sumekibe.ecocaregreen.com/uploads/1/3/1/0/131070115/tolurakimef.pdf
    • http://files.tomatbaylor.com/uploads/1/3/0/8/130813650/2532748.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/gizumuwonufewinapavaxur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/65600740757.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/kagufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0153/4875/files/23668655879.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/html2pdf_set_default_font_arial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/nirekuvug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/duwosupagasosisij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/xenogamekitot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/83095974355.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/pedusonen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/76055065464.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_off00004d59.bin
d17633bd20b351e48da9f581ad770df24fdcc0a9c375f7e5a1a4c0d923cf4fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D59 5704 bytes
font_01_sfnt_off000060c5.bin
9519a85867d5b75a43a361b01f23009694754004c73eeb16415b30212f797679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 10208 bytes

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