Malicious PDF — malware analysis report

Static analysis result for SHA-256 1569cf4e8244c907…

MALICIOUS

PDF

46.2 KB Created: 2020-07-30 20:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201041fbc3024d644a83c5a61338464e SHA-1: 141988be87ea66ef6420cc01066936fc6f448187 SHA-256: 1569cf4e8244c9073ad7a3c7957d0ace6121e1b7a04cad75e284ae93b05dc589
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, with one identified as a malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. The ML classifier strongly indicates malicious intent.

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/pify?keyword=ejercicios+rima+asonante+y+consonante+5o+primaria+pdf
    • http://files.darrylstrange.org/uploads/1/3/1/6/131637362/simotewoziruf_durexiwajiboxe_wiwogapikegogi.pdf
    • http://files.rubyslipperfund.com/uploads/1/3/1/4/131453823/wagemivoxola.pdf
    • http://files.womancarehomemidwifery.com/uploads/1/3/1/4/131405948/5096084.pdf
    • http://files.elizabethweybright.com/uploads/1/3/1/4/131452815/7832542.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/93080496462.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/xezekuwilojolamaxapedarol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/40099207802.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/fodunonetudeziwumujapuzod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/75694849921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/75820527855.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/josadixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8203/files/dodiwotarabalosixaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6083/files/najegaloguwexolovawuzalag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/pifabajefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8696/files/tunofekiridapif.pdf
    • https://cdn.shopify.com/s/files/1/0428/5104/1447/files/kebelukokezugukefogasa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/rigibozebuladalofinerusas.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_off000072ec.bin
52d9810a5c7f17bac179d7f0572f20ed7c90b731f5638ecdae155a7729cd8a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 5316 bytes
font_01_sfnt_off000084f2.bin
cbf4b39407b51a671b27aa0ee9764923ba8c69fc58b708ebdd86776ac3ba84c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 11060 bytes

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