Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d74166d891cc3ea…

MALICIOUS

PDF

58.7 KB Created: 2020-07-29 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bdde31adea11eba10c69871908134f SHA-1: 48a2e75babd4d6da9fed249d125b12b3fce35908 SHA-256: 4d74166d891cc3eaa2ba52379bcc7763afa2ffafa4da4c5d9417cc2873419eff
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This link, 'https://ttraff.ru/pify?keyword=chemistry+periodic+table+pdf+a+level', is designed to lead users to harmful content. The PDF also features a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results for malicious purposes. The ML classifier strongly flagged this PDF as malicious.

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=chemistry+periodic+table+pdf+a+level
    • http://files.kiliriseadventures.com/uploads/1/3/0/7/130739069/mejulenimevinunulu.pdf
    • http://files.lbvc.co.uk/uploads/1/3/2/6/132696465/gozemojebasimafiwom.pdf
    • http://files.alliedfireandsafetylillington.com/uploads/1/3/1/0/131071258/pawafadefixanajon.pdf
    • http://files.welearnbyheart.com/uploads/1/3/2/3/132302992/doweve.pdf
    • http://files.vietcapitalcorp.com/uploads/1/3/0/7/130740510/dc24984.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/kunomewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/jozufiditutesemakazamejej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/48586443789.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/narowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/guxuvesemiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/78205460191.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/weluza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/18282563783.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/78329787598.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/1474826959.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/31975739748.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15518423203.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/nuwotixutogeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a858.bin
15d004b301b294955f1fd6161f1f38205dd5003a08c9383dfdd3b341ba8816e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA858 5404 bytes
font_01_sfnt_off0000bac0.bin
3158da874265ee59f689bbd49fee1fb0dbfdb82081b9d224187c5ff13eb49b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 10032 bytes

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