Malicious PDF — malware analysis report

Static analysis result for SHA-256 774dc1b1e8bf12bd…

MALICIOUS

PDF

58.4 KB Created: 2020-07-29 12:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221a99bc8a9328faa5d0b477a75f62da SHA-1: e08501b08670bdae74d725c54405b7fed3a7eff4 SHA-256: 774dc1b1e8bf12bd0898542290b06f6a9f69960a782864b11ac88d9a997ea5c2
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded links suggests an attempt to drive traffic to malicious infrastructure, potentially for SEO manipulation or to host further malicious content.

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=arrays+in+c+pdf
    • http://files.speakadelic.com/uploads/1/3/0/7/130775304/venusun.pdf
    • http://files.deemerphotography.com/uploads/1/3/1/4/131437247/4661083.pdf
    • http://files.daviscountydoulas.com/uploads/1/3/0/9/130969446/8666630.pdf
    • http://files.ancientwavestudios.com/uploads/1/3/1/3/131384635/c7ea8.pdf
    • http://files.cfcstuttgart.org/uploads/1/3/0/8/130874396/13e1a697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/27937360421.pdf
    • https://cdn.shopify.com/s/files/1/0428/8072/9251/files/somosabe.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/25823263214.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/bidow.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/korevujox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/pugalodoguwubava.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3821/files/83868524273.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/45605830219.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/tebojopox.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/luzofedupipubawobupo.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_off00009ba3.bin
4ad96c491162bcc6cdacf58c940fe4ad264ee00f6a1129d6154396a40fffc621
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA3 4688 bytes
font_01_sfnt_off0000ab92.bin
9a2b7690413e8ac18f6bf0ccb986daabbd1b78ee39671d16c7e7f15bd5f0ba52
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB92 15392 bytes