Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f09ec9b27f985d…

MALICIOUS

PDF

47.6 KB Created: 2020-08-19 05:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2663f26cd12ee9e248ac166be73e4c5d SHA-1: d699a0c477721b1c3b901aeb481a16a082180f18 SHA-256: 93f09ec9b27f985d1f07a008a6477d25db3774641178340cf1ba6fb3667c2e1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=grade+5+math+equivalent+fractions+worksheets, which is used to redirect users. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=grade+5+math+equivalent+fractions+worksheets
    • http://files.schooolfixers.com/uploads/1/3/0/8/130813550/betawenadovokewu.pdf
    • http://files.cvccacounseling.com/uploads/1/3/0/9/130969075/zibojelel-pesaxemil.pdf
    • http://files.pemberton-browne.com/uploads/1/3/0/7/130775892/sirozaboj-vavekizir-galebudi-gulili.pdf
    • http://files.stephtalksfood.com/uploads/1/3/1/6/131636766/1536315.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9540/files/comment_fusionner_deux_fichiers_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/23372987287.pdf
    • https://cdn.shopify.com/s/files/1/0439/0646/5947/files/boreverifimasadilopiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/21289739997.pdf
    • https://cdn.shopify.com/s/files/1/0436/7243/6889/files/93294141293.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/gused.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/vewojazinetogugememarum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/54148190752.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/pdf_file_online_reduce.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/45648991712.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/blackbird_uke_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/zitidedomogo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dde.bin
bb8bd318e4cc86368413566c33a4add0f400b85dc3fef1c567abffc9ead68e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDE 5640 bytes
font_01_sfnt_off00008104.bin
cb40f1ed3ea741b8fc965f7fd9b80935e6a3f6f8f5851cae7263ff168227e9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8104 9956 bytes
font_02_sfnt_off0000a31c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31C 4324 bytes

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