Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4b10153ec01e5…

MALICIOUS

PDF

40.7 KB Created: 2020-09-23 18:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73eaaf524dd317399100f8d064ec672c SHA-1: 72c94d53d77a0b3f3523c3b0b0c857ac582ed51a SHA-256: 5bf4b10153ec01e554a47c72dc6b0251b11eb03936ee14c445debb6dff5272c3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded link and the nature of the PDF suggest it's part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=jimmy+valentine+question+answer
    • http://nosiku.brandonrdavis.com/uploads/1/3/2/8/132815828/dakoji.pdf
    • http://wenago.broadwaysupplystore.com/uploads/1/3/1/4/131483222/c627fd.pdf
    • http://files.dmsmallengines.com/uploads/1/3/2/6/132681671/4491526.pdf
    • http://files.journeybackancestry.com/uploads/1/3/0/9/130969254/sugomodolewiwobo.pdf
    • http://files.coastalsilviculturecommittee.com/uploads/1/3/2/3/132303147/4a7e262366e75a.pdf
    • http://vapafet.americanaprime.com/uploads/1/3/1/8/131857090/5218262.pdf
    • http://depewej.racenterprises.net/uploads/1/3/0/7/130776138/tuzujojujukobizej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/17519072292.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/35666264251.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_off000061d5.bin
6f02257d31917052db60894b02adc201dfc6cba5a2b85d351068e0dd232a793f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 5200 bytes
font_01_sfnt_off0000738a.bin
450c3dbe0b6464193f40c0b6ad5245a2b9665f366ba079421c518e014b53636b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738A 10380 bytes

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