Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b624afc8f3ae64c…

MALICIOUS

PDF

39.7 KB Created: 2020-09-07 18:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000d496b1e365d5b1eafca9cc72f2d25 SHA-1: 00e133ee3ee805c29dd5b0a50ac379f0295ddbfc SHA-256: 0b624afc8f3ae64c39f3ffe07512ac454c253291d23dd414c2bc42c357dd5145
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for 'samsung allshare windows 8'. It also hosts a large number of other PDF files, likely for SEO manipulation to increase the visibility of the malicious link. The ML classifier strongly indicated maliciousness, and the embedded URL points to known malicious infrastructure.

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.club/wix?keyword=samsung+allshare++windows+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/bully_max_high_performance_uk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/direito_processual_civil_daniel_amorim_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/context_diagram_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/vivexegegoputegurugemoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/vietnam_cement_industry.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/34808736361.pdf
    • https://cdn.shopify.com/s/files/1/0454/3823/8878/files/pinej.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/nadisuforipixiderile.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/retinopatia_hipertensiva_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/99137056814.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7622/files/46111015950.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/how_to_add_modifiers_tinkers_construct.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_off00005d36.bin
53537238f4ff87922a02029c24b25b77777d894083cae89678d6cede8c2f4d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 5628 bytes
font_01_sfnt_off00007033.bin
9315108bdf4da0ad6a2eb6c990644f5eaeaeae12f501d1a8326de5207569384f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 9972 bytes