Malicious PDF — malware analysis report

Static analysis result for SHA-256 789d933c0991a54d…

MALICIOUS

PDF

52.0 KB Created: 2020-08-02 10:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8d993875aba3ca04910859388fb258 SHA-1: d1046a87ee8382e8c91f5f6d66fe903e4cf713f4 SHA-256: 789d933c0991a54d7de658617bbfce95784b42bed77e14fca9da72d200d134e6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=kms+client+emulator`. It also features a large number of external PDF links, suggesting a link farm. The document body contains text related to 'KMS client emulator' and instructs the user to copy/paste content, indicating a lure for potentially unwanted software or further malicious actions. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=kms+client+emulator
    • http://files.dscampers.co.uk/uploads/1/3/1/3/131384025/ef14352ba100b.pdf
    • http://files.monetandme.com/uploads/1/3/1/3/131383424/25f466acc.pdf
    • http://files.lorivilagos.com/uploads/1/3/0/9/130969825/novitu.pdf
    • http://files.cynthiawelchdesigns.com/uploads/1/3/1/6/131636655/lalexukimapefujap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/68915569838.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/44864662515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/futikuzazojexopuvenewipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/istick_pico_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/lefadamupeka.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/xutijosulozedatinafanud.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/new_testament_seminary_teacher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/dapipunonajebedamoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/berunogomesatusote.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/1159485968.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f77.bin
fadf930682beec096d4ad89edecb71212bfd0c42d23bd863f2c54ecd0c91a3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F77 4916 bytes
font_01_sfnt_off00009018.bin
76ec2da7fbb526f4c57685aae20428d0ef6e964d35372d9a745796b8e3c94aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9018 16820 bytes

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