Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ece05eca004a25…

MALICIOUS

PDF

35.1 KB Created: 2020-08-12 17:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f389d91bb3f9c66e22a59c88d14734 SHA-1: b0f2459156e1bf4db08650a47ba9b334fbbf961a SHA-256: a2ece05eca004a25df152227db5bf02fb3ae3e20bc888e03bc09127bdd67ac6b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise or deliver it.

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=cambridge+igcse+computer+science+coursebook+cambridge+international+igcse+pdf
    • http://files.wordisart.com/uploads/1/3/0/9/130968921/2694075.pdf
    • http://files.mrstuckeysclass.com/uploads/1/3/0/7/130776841/4143467.pdf
    • http://files.twopsinapodohio.com/uploads/1/3/0/9/130969654/1318364.pdf
    • http://tawobi.rfjnoel.com/uploads/1/3/0/7/130739124/dofun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/28652674698.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/4636072383.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/80112519417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/american_pie_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/97915661946.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/volvo_bm_6300.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3876/files/45675381464.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/16667401599.pdf
    • https://cdn.shopify.com/s/files/1/0441/0530/2168/files/jaganazux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/18473012.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/ada_diabetes_2020_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/50212162967.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_off00004a0c.bin
47072168bd8d746e941a09f38c724e3909829c13231fc498a5877825383e29e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0C 5584 bytes
font_01_sfnt_off00005cf5.bin
fe25cd790091248e00fad6a43cb9e2efe19f2078d59aa7579034c67251a6405f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF5 10044 bytes

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