Malicious PDF — malware analysis report

Static analysis result for SHA-256 6615ba402371536b…

MALICIOUS

PDF

56.5 KB Created: 2020-08-12 05:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e2580b9b1a20d99b32ae5e15d3fe6bf SHA-1: 35fc312f4f57c2734657034f15d12d2df1681c86 SHA-256: 6615ba402371536bdc2d80c91f2e9335520c28b13914ad42ad7e94583748f357
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains references to academic guidelines and URLs, suggesting a lure to trick users into visiting potentially harmful websites. The ML classifier strongly indicated maliciousness, and the presence of numerous links to external PDFs supports the 'link farm' heuristic.

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=antithrombotic%20therapy%20for%20vte%20disease%20chest%20guideline%20pdf
    • http://fuxone.jackandwinn.com/uploads/1/3/0/8/130874566/gasewa_zegepefan.pdf
    • http://files.hermitthrushhomestead.com/uploads/1/3/1/4/131438718/4fc7b3c010b279.pdf
    • http://zegiduri.higherlivingnetwork.com/uploads/1/3/0/9/130969130/62eecd.pdf
    • http://files.guide2tech4teachers.com/uploads/1/3/2/6/132695517/96f6c35723c.pdf
    • http://files.dptrackandfield.org/uploads/1/3/1/3/131398117/b31adad475303.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/mukobenoluwisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/manual_windshield_wiper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/89409360145.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/39758060999.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3475/files/nuvapinimemuluzosorux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/21813391589.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3833/files/jujilofidafepubifanuge.pdf
    • https://cdn.shopify.com/s/files/1/0435/2062/2756/files/catholic_study_bible.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/79509239719.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/5e_paladin_guide.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_off000099fe.bin
11c2ad1caae8e9209ff2de23a9b92859eb571ae74ddc82fbac42fcf05677c6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FE 5860 bytes
font_01_sfnt_off0000adc8.bin
24ae1e7f40ee7ef1c63bb7fef9b099145875c7285df8d0f5e51b103cef2ac319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC8 11988 bytes

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