Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b79b0dd070ad121…

MALICIOUS

PDF

43.9 KB Created: 2020-07-12 20:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88d6d2033d0c3894fd774d3ecd6a0337 SHA-1: 1716ee6538df4894388765f2c18ede7ba7d96a09 SHA-256: 5b79b0dd070ad121d0046d2fb5d1cb599fc9312c3a95f767ecacd6a0283d23af
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or hosting a link farm, potentially leading to malicious content or 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.com/wb?keyword=relative%20pronouns%20sentences%20worksheet
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.ewiechart.com/uploads/1/3/2/3/132302913/gomokiwu-dapewijutufose-jofumuvusu.pdf
    • http://files.myhalcyonic.com/uploads/1/3/1/4/131438843/navigidarupe_megamebun_mefagewovavusu.pdf
    • http://files.volnaiskra.com/uploads/1/3/1/4/131454098/792583d732dac8.pdf
    • http://files.sdrm.shop/uploads/1/3/0/7/130739809/7638706.pdf
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdf
    • http://files.oliviaunderwood.net/uploads/1/3/0/7/130776219/zazelokorejo.pdf
    • http://files.brentshirleyband.com/uploads/1/3/2/6/132681213/giwumolorozunigar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rovekozo.files.wordpress.com/2020/06/jewegimatutalow.pdf
    • https://xefupixebi.files.wordpress.com/2020/06/rezavosebujegonibipa.pdf
    • https://guvusumanev.files.wordpress.com/2020/06/kumolavoxozinuvudeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/divulerarimosi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/15079615601.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/23425961699.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/bekuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/52521166874.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/sejinanapoxegene.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_off00006ee4.bin
aacee0f002723f95136506c6c34e02733ed95e7ba0cf8a8ce6ce99c972859cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 5124 bytes
font_01_sfnt_off00008061.bin
2afd1c2274297aaf0ae9ff1a1143a759d4856f5872a112c00c82d5e55c386f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 9988 bytes

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