Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1d9f26a326f8e4…

MALICIOUS

PDF

66.2 KB Created: 2020-08-31 09:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a435521886b309bdebcaf1696c12a142 SHA-1: 4fbaf8be8ac35f90fd6aad669de4b49a0b6d4ba5 SHA-256: 6c1d9f26a326f8e4ad7ded90b0aa08d869d9d4277c47275e93c29703dd93b187
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a malicious redirector. The presence of numerous links suggests an attempt to manipulate search engine results or to distribute malicious content through a link farm. No scripts were extracted from this sample.

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/wix?keyword=%25C3%25A9valuation+tables+de+multiplication+cm2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/dld_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/48171983009.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ximulomonarosaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6712/0539/files/86010399646.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/jisir.pdf
    • https://cdn.shopify.com/s/files/1/0448/0493/1746/files/dokumen_amdal_hotel.pdf
    • https://cdn.shopify.com/s/files/1/0434/3608/1308/files/zasemutigumodopusag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/fajureborixelagizotofa.pdf
    • https://static.usrfiles.com/ugd/6116da_ab8e1eefe61c455db17677779e993fdf.pdf
    • https://static.usrfiles.com/ugd/271e65_eec45bc90f9b4203bfa9e674f945161e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab03.bin
e7e68acac445fee19179c6973d7c9955bdb8e4d6a610f93e1dae1256f02129a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB03 5436 bytes
font_01_sfnt_off0000bd6d.bin
4fa6bcc5cec4229722c83c4173e7f64c95b68c58bb006a2a75c2ade0258662be
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 12476 bytes
font_02_sfnt_off0000e470.bin
4935603ab55f76872287563a9769dd1c174124dacc281fee03fb2e864e4c444f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16144 bytes