Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c858c341c72f8d5…

MALICIOUS

PDF

44.1 KB Created: 2020-07-31 10:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cd7f7e49e5fff76f2aedaf287baa303 SHA-1: 5241f796d1114d7124e6cc181a5172eb59cc9a13 SHA-256: 0c858c341c72f8d5415c4c39ab11b3ce4e55fecc5f8da78bff8987b2e9aea98d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a malicious intent to direct users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest this document is part of a phishing or scam campaign.

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=apprendre+l+anglais+des+affaires+pdf
    • http://files.treeoflifetroupe.org/uploads/1/3/1/6/131637723/donirimiwiti.pdf
    • http://files.swanspirit-perthwa.com/uploads/1/3/1/6/131636775/mewunigigu-nanuk-bolow-tizotutumomo.pdf
    • http://files.capecodmedium.com/uploads/1/3/1/3/131397940/nosurelixagiwulezagi.pdf
    • http://files.hongaku.net/uploads/1/3/1/8/131857305/38894953d6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/pirud.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/fasulivovapamorojafuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/24910696956.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/mobaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/juzexole.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/mekalaredi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/32423925740.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/gasonamudi.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_off00006dd9.bin
f9b4fdae16a394a1780743f65b6db152da6756a98a32c6cdd7c200dc24f53565
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 4796 bytes
font_01_sfnt_off00007e20.bin
2e3c188f712b3184350b8f1726af00e153b80907ff527589087fde8a39be20b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E20 11148 bytes