Malicious PDF — malware analysis report

Static analysis result for SHA-256 40144ee80c0940e9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-25 00:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5aef69255cde90f73774d7170e392e3 SHA-1: 30e9fb2093b1f037d79231905d82475fc64696ed SHA-256: 40144ee80c0940e96fc54c9724b3cba52a5f952123b970266acfd2588979bf66
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, https://ttraff.ru/pify?keyword=asphalt+7+android+game, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=asphalt+7+android+game
    • http://files.jberaeroclub.com/uploads/1/3/0/8/130874646/lasopuxuzofijofapowu.pdf
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdf
    • http://files.alesiaart.com/uploads/1/3/1/8/131856232/4771045.pdf
    • http://gikugukem.cobbosseeconteesnowmobileclub.com/uploads/1/3/0/9/130969521/6c423cf50a18a.pdf
    • http://lorewuj.element3healthclubs.com/uploads/1/3/0/8/130815017/3115306.pdf
    • https://cdn.shopify.com/s/files/1/0445/3341/6095/files/30405314476.pdf
    • https://cdn.shopify.com/s/files/1/0451/9323/2535/files/libro_diario_de_los_escritores_de_la_libertad.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/gopodomikajodero.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/forasopijafonotobojak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3696/6055/files/lopovonomesigetuxufozasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/5457450961.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/beginner_violin_duets.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/xiruwapejobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/zelajigane.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/apprendre_a_parler_anglais_gratuitement.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/28502120791.pdf
    • https://cdn.shopify.com/s/files/1/0429/0845/0972/files/vategowisesizebonoxamor.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_off00006cae.bin
3821b12758a8e4fb8293be776423f48d9ce527bebf3453f8a6d10b12ee9c5d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 5444 bytes
font_01_sfnt_off00007f00.bin
22c6dc64fc7b68a7ea708d9fc98649a9e8abe4bcf51b20a2488deccd8e2fe728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F00 10292 bytes

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