Malicious PDF — malware analysis report

Static analysis result for SHA-256 e262c0636eda9528…

MALICIOUS

PDF

42.8 KB Created: 2020-10-08 18:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10eb96cb0d1b7df934c6439d99520843 SHA-1: 3217ec29934c66251e14396e97a0ff603fc0e94a SHA-256: e262c0636eda95282a27461b11c7b8804a3e5a597dc32a4bd875160b9038ab94
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Middle T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests a link farm or redirection strategy to lead users to potentially harmful content. 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://cctraff.ru/pify?keyword=que+son+estrategias
    • http://files.veamsmacro.org/uploads/1/3/1/6/131606177/zemixaxevixakuparu.pdf
    • http://files.shaakirasharifeducationalpsychologyandtechnologyprogram.com/uploads/1/3/1/3/131383475/eb6841056eb7ba4.pdf
    • http://files.thecarmaven.net/uploads/1/3/0/7/130776420/tugul.pdf
    • http://jamaj.theopenbus.com/uploads/1/3/2/6/132683138/vamusedejagi.pdf
    • http://lurexotek.powysdragons.com/uploads/1/3/1/0/131070588/d367351c3c7574.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/maruzokiwexonadogo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/tefuf.pdf
    • https://cdn.shopify.com/s/files/1/0483/0121/1809/files/hamilton_livestock_auction.pdf
    • https://uploads.strikinglycdn.com/files/85b8a5a5-25db-49e9-b861-400416f0ecb3/sarinukejifefilumaxoda.pdf
    • https://uploads.strikinglycdn.com/files/bffb5992-e742-42a6-8b9c-2f307cbee518/42678315162.pdf
    • https://uploads.strikinglycdn.com/files/7d49d12a-ad10-4120-8925-1474060edf12/zaroligeke.pdf
    • https://uploads.strikinglycdn.com/files/6723d68d-9f28-4b4b-8b6d-f558689075cd/58510207402.pdf
    • https://uploads.strikinglycdn.com/files/eb4e0d5c-f194-47c0-ad69-c41375fdb032/dibakururese.pdf
    • https://uploads.strikinglycdn.com/files/92a6ac3b-d1ee-4f01-ae59-f52ee629dad6/lexepowerepozuvuzutaguf.pdf
    • https://uploads.strikinglycdn.com/files/f93f151f-57e1-48d5-b61a-8c60c00bf10f/23315963548.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683b.bin
f24f5e1704c6f5216528fb7b0cd3c45866a28f40fce1397b821bd7918eca167e
pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 4884 bytes
font_01_sfnt_off000078e7.bin
077305be62235e7459ca58ab6b48f0f2212cc714a7bca47192eb2641fe17dd2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E7 11164 bytes