Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b66c16ec1408db3…

MALICIOUS

PDF

43.7 KB Created: 2020-08-17 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 194d751189ac401b4afd6ff93478bea9 SHA-1: afd179a0f13c3db8f3ac394c80e69c7f8bf2ec6c SHA-256: 0b66c16ec1408db37a8d9346ae4ca42dde18a3744a1de5a1b0a5a128242fb4bb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially malicious redirectors or link farms, indicating a phishing or scam attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to copy and paste commands into a shell, a common technique for executing malware. The ML classifier also flagged this PDF with high confidence.

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=docker+toolbox+windows+guide
    • http://juvef.hollyebony.com/uploads/1/3/1/4/131406390/eaa90aef662fc.pdf
    • http://files.donnaliberalistore.com/uploads/1/3/1/4/131406149/27e05cb0bfb.pdf
    • http://files.fiveanimalkenpo.com/uploads/1/3/1/3/131378950/9462352.pdf
    • http://files.mrallansciencegfc.com/uploads/1/3/1/1/131164440/mekituwiduw.pdf
    • http://nanukum.calas-ct.org/uploads/1/3/1/1/131164239/wujefusap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/bolokikapejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/siwanolusamupijatewopatub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/wolapepaduj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/imaginary_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/19990052110.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/conan_exiles_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/90017515423.pdf
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/eserciziario_analisi_logica_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/bhaktamar_stotra.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/wimsatt_beardsley_intentional_fallacy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/70339671371.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_off0000650a.bin
8d31b40d74094f722226b58277dcf692a5d7e5288fdcab407e56a4312b775177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 5260 bytes
font_01_sfnt_off0000770b.bin
a056856a4a7b07df536428a9de679f83d5dbe2766f210d65a9f5cfc67740e799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 13528 bytes

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