Malicious PDF — malware analysis report

Static analysis result for SHA-256 1763d1a6a7123fe9…

MALICIOUS

PDF

55.3 KB Created: 2020-07-18 19:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5c33ae026de1c22eaae9905b66b233d SHA-1: a8b9bb45d6b33de58a285ad48a9f66b9a3e10c82 SHA-256: 1763d1a6a7123fe92dac3180fa8b7ced507e69c75033488ae930fc49ce0b98f7
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The embedded links suggest a link farm or SEO manipulation tactic, potentially distributing further malware or leading to phishing sites.

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/wb?keyword=cuidados%20del%20recien%20nacido%20en%20enfermeria%20pdf
    • http://files.bbpregistry.com/uploads/1/3/0/7/130739522/dovabatilokawawofen.pdf
    • http://files.greatlakesherbfaire.org/uploads/1/3/1/8/131857049/06909d46da622.pdf
    • http://files.bible-truths.org/uploads/1/3/1/0/131070452/fa9376ad.pdf
    • http://files.dalewoodbaptistpdo.org/uploads/1/3/1/6/131606003/wolalikaketed_juzegepupegox.pdf
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdf
    • http://files.kayandthechaos.com/uploads/1/3/1/4/131406985/mojige.pdf
    • http://files.theuglybowl.com/uploads/1/3/0/8/130813582/40469d4d86.pdf
    • http://files.christopherbelser.com/uploads/1/3/2/6/132682686/7611331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tizakifu.files.wordpress.com/2020/06/46372102930.pdf
    • https://gususipo.files.wordpress.com/2020/07/jegigewuneladeta.pdf
    • https://relotudop.files.wordpress.com/2020/07/mevigixakilun.pdf
    • https://kuzopate.files.wordpress.com/2020/07/pomaxovegex.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/zixekos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/4501926129.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/97971119847.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/97128437150.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/21097825898.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/kasofikarew.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/sofarumedumazoboj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/20851634955.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.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_off000099b5.bin
891a1d5d9b29b4eb0c7f0924c04f3ec69d00d2bd08959855267a706b75c6fe74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B5 5124 bytes
font_01_sfnt_off0000ab03.bin
1e691ece6d1df41ef7e354e622324606a7e21f5bd015e7114d8eb1f738ba80d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB03 10660 bytes

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