Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a7a4f1f950e026…

MALICIOUS

PDF

46.0 KB Created: 2020-08-05 10:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27fe13c2c7017b2c49efcb266aee685e SHA-1: 23bed689fff5cfbb090f88bfa1a94aab198d3ce3 SHA-256: e7a7a4f1f950e026335944205a7c75f1cc34d63e77edfcbf9a395b350aa66407
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, which is indicative of a link farm or redirection scheme. The primary malicious link, https://ttraff.ru/pify?keyword=the+socionomic+theory+of+finance+robert+prechter+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this malicious URL, suggesting the intent is to redirect the user 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/pify?keyword=the+socionomic+theory+of+finance+robert+prechter+pdf
    • http://tetagug.chelseylovenutrition.com/uploads/1/3/1/8/131871650/zegupuranazanumezu.pdf
    • http://files.tetoncountydems.org/uploads/1/3/2/7/132740700/73efc521d951b83.pdf
    • http://files.cjsprofessionalcleaning.com/uploads/1/3/0/7/130776275/mimumasek.pdf
    • http://setinag.menzieslawyers.com/uploads/1/3/2/6/132695384/ramowegejajug.pdf
    • http://files.jackienorman.com/uploads/1/3/1/8/131860787/xewaguxevaxo_xarak.pdf
    • https://cdn.shopify.com/s/files/1/0444/4625/3222/files/arabic_geometric_pattern_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/8134179661.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/katipavubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/12517511741.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/65484576346.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/kewujitabir.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/marathi_katha_kadambari_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/23439403006.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/debidurake.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7592/files/fovegunaparodugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/24088902860.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/pevobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/27381573858.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_off00007567.bin
828916907309ce03509a11afa5cb65d8fba5c6e7370ef04ef347f636f623d8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 5552 bytes
font_01_sfnt_off0000881d.bin
10586853f1b66ec6f41858c8c121b9c859c0cc7a9c3fa03006604b11ad4bf9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881D 10008 bytes

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