Malicious PDF — malware analysis report

Static analysis result for SHA-256 631de6520afc924c…

MALICIOUS

PDF

39.4 KB Created: 2020-06-23 02:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2c1a769680f757f4c804f7aa3190da SHA-1: 22d34e4f9e484c5bc9fa1a0bc48bf6633a44fec3 SHA-256: 631de6520afc924c84535a2426d7d8c545bd054257515cb7f61a1e436973ef34
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO abuse. The presence of a 'download button' heuristic further supports the interpretation that the document is intended to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://morethanjustaface.nl/uploads/1/3/0/6/130603958/130603958.html#suzuki+piano+book+2+pdf
    • http://globaly.org/uploads/1/3/0/2/130289542/7563287.pdf
    • http://hostmaster.samoyed.net.au/uploads/1/3/0/6/130622083/037f8c.pdf
    • http://theartintruders.com/uploads/1/3/0/6/130621026/e03f138d22b5a0.pdf
    • http://theknowledgewarriors.com/uploads/1/3/0/7/130739528/964c1e731.pdf
    • http://abmechanical.net/uploads/1/3/0/7/130774966/wibawavi.pdf
    • http://hostmaster.winefest.ca/uploads/1/3/0/5/130551399/fbd95cf6a93d3a8.pdf
    • http://michaelkitzes.com/uploads/1/3/1/4/131410736/246c42a486787.pdf
    • http://maynrenobuild.com/uploads/1/3/0/5/130551607/3854478.pdf
    • http://beijingpost.org/uploads/1/3/0/7/130738997/5e88903d3af7bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005d2a.bin
c85f6c6f5caadd73ef0f95953c1b79949b1f58d460c3443e9ddd2522df88395d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2A 4900 bytes
font_01_sfnt_off00006ddd.bin
1f689c7bf12cf7413fbff6aa2e33682026a3030232a0de984955f38e928b9144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDD 10688 bytes

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