Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d956b86aa02a887…

MALICIOUS

PDF

35.0 KB Created: 2020-07-08 15:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d383c7a89b97878437e7507251beab2 SHA-1: 88b6743aee61b71372deb95a90c65bd2c4f4c3d1 SHA-256: 2d956b86aa02a887bdcb0b769da246306edfdf39fde44091051e75e526efb12a
152 Risk Score

Malware Insights

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

The PDF contains a deceptive lure related to 'English conversation test for beginners pdf' which, upon inspection, redirects to a known malicious domain. The document body and heuristics indicate a link farm designed to host numerous PDFs, likely for SEO poisoning or to distribute malicious links. The primary malicious URL identified is https://ttraff.com/wb?keyword=english%20conversation%20test%20for%20beginners%20pdf, which is a critical finding.

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.com/wb?keyword=english%20conversation%20test%20for%20beginners%20pdf
    • http://files.acappellakentuckiana.com/uploads/1/3/0/8/130815095/numawamexizatex-nijufebifalegag-xidaga.pdf
    • http://files.davemcdermand.com/uploads/1/3/2/6/132695361/faxevedepu.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://files.noswfoundation.org/uploads/1/3/1/0/131070527/6085821.pdf
    • http://files.clairestephstudio.com/uploads/1/3/0/9/130969386/vigif.pdf
    • http://files.sbcopywriting.com/uploads/1/3/2/7/132740218/644292.pdf
    • http://files.healthqueenavis.com/uploads/1/3/0/7/130776266/1982664.pdf
    • http://files.bullbearkidsbooks.com/uploads/1/3/1/4/131455463/84515.pdf
    • https://xerexaxagase.files.wordpress.com/2020/07/9429041026.pdf
    • https://sonizoziva.files.wordpress.com/2020/07/61056868645.pdf
    • https://rejogivowub.files.wordpress.com/2020/06/70437521730.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_off00004b4f.bin
b0aae774b6e587fa791391b48c78da0fded76f5618cd4a0728b98e905dd8de19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4F 5364 bytes
font_01_sfnt_off00005d7a.bin
da5ebd445ea2a0fe73c2e8cf05ef04e8271acf3495286f2a914a7cd3e1bfcfe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7A 9896 bytes

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