Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d8dc388347ab7a…

MALICIOUS

PDF

45.3 KB Created: 2020-08-22 20:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08cfe6320b678c5cf50ba5c0f6f01a86 SHA-1: 9c264dcaa9d0785bb37ea91a75b29e6ea3a14417 SHA-256: 77d8dc388347ab7accfff65e2c39f0cdd6fc9780df9c76fce9b6a8db75a8f4ba
162 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The presence of numerous external PDF links suggests a link farm or a method to distribute further malicious content. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=bsc+nursing+form+date+2020+rajasthan
    • http://fivugugu.angelaherbert-hodges.com/uploads/1/3/2/7/132740763/1775cf58f.pdf
    • http://files.nxintl.com/uploads/1/3/1/0/131070911/nufawefomojoge_tadugusovok.pdf
    • http://vomapaxa.roxannesmith.ca/uploads/1/3/2/7/132740214/mujefedeko.pdf
    • http://files.shaunmartinmusic.com/uploads/1/3/1/3/131379382/6d7224.pdf
    • http://files.cartooncaveman.com/uploads/1/3/1/4/131409200/e4409dfe48f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/xiwedetonoxudunepopexufa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/lalugaweminumewafawiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/41241809087.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/gijutifizup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/gejujefebidavovozivet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/bomiwadonisogeju.pdf
    • https://cdn.shopify.com/s/files/1/0460/1063/0311/files/woruvejimerevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/arnold_chiari_malformation_radiology_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/nmr_spectroscopy_principle_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/8679885062.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/nomerarenoronafezulanapip.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_off000068bb.bin
308ea25968e97f5eebf1dc68dbfcbe11477c26138f215d97c334fae77ca5f463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5804 bytes
font_01_sfnt_off00007c52.bin
2d978f4a67fb6cebcb03b791e6ea2b79e7d1d2809f2e077d951c4f449704a3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C52 14060 bytes

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