Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a92bb51fdd5e1e1…

MALICIOUS

PDF

39.3 KB Created: 2020-08-10 11:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32f1d5776b19b7ef8c6ca9687731541 SHA-1: f09bd3d8f870f8d986360ca97d3321a87ce71cb9 SHA-256: 9a92bb51fdd5e1e1a8751cfc4737b2f308afb25fbf2fddaf5c943c9cafa28826
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a common tactic for SEO spam and phishing campaigns. One of the primary links, 'https://ttraff.ru/pify?keyword=realistic+rock+drum+method+carmine+appice+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the intended destination. The presence of numerous other links hosted on various domains further supports the link farm heuristic. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

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=realistic+rock+drum+method+carmine+appice+pdf
    • http://nowoxe.victoriahulltemple.com/uploads/1/3/1/8/131857315/6888926.pdf
    • http://files.maitlandstreetrodders.com/uploads/1/3/1/4/131437017/nufigu.pdf
    • http://files.4loveofbaskets.com/uploads/1/3/1/6/131636651/kotoku.pdf
    • http://files.fumigation-services.es/uploads/1/3/1/4/131407051/goderotorebawuduna.pdf
    • http://files.essexwindowfashions.com/uploads/1/3/0/8/130814831/4125604.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/trapping_rain_water_leetcode.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/tuvuga.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/37659177095.pdf
    • https://cdn.shopify.com/s/files/1/0433/0366/5822/files/gegimodobusigozalegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/sumawumosepubebiganowon.pdf
    • https://cdn.shopify.com/s/files/1/0429/6533/6217/files/jinaniwugipudemumabinib.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0394/files/ashrae_handbook_hvac_applications.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/bujinesuxunedabodozugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/sekowegudesuzunobu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5559/3110/files/togevobimusezetite.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/gezunadufupexavatomaxe.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9079/files/earth_s_atmospheric_layers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/saruxuturolulanodixaka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e61.bin
b42358aaafb80a3aa4da563da2f488f65f1ff62f656110f4a662dc7c2610bdab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E61 5348 bytes
font_01_sfnt_off0000605d.bin
e32c3f72a951bed9ec5a9ecc580eea7acc04e1039b33204dc754dc588b948a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605D 9740 bytes
font_02_sfnt_off0000819f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 4324 bytes

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