Malicious PDF — malware analysis report

Static analysis result for SHA-256 feec331efb3653b3…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 19:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9daf853a87a83b681dddd9011ea1934 SHA-1: 8ae89f5a977a0f4d2e20ea06a513b1661bd0008f SHA-256: feec331efb3653b373da7d3acfa8b154d96bd9ec372db7290082d66943a2384d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a lure for a 'Minecraft free trial' which redirects to a malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this redirection to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the document is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=minecraft+free+trial+windows+10
    • https://static.usrfiles.com/ugd/4bdc6d_6f0484c2e00549e48d8149f2ec5bea19.pdf
    • https://static.usrfiles.com/ugd/4b7290_5f0917a20b9a4038a65f824d463d0d8c.pdf
    • https://static.usrfiles.com/ugd/b916f4_61c23f73b10f4a55899fed91e712d41c.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_5d10a9cd4ca54ea69c59fb6afef7d68a.pdf
    • https://static.usrfiles.com/ugd/0e2875_69f9056958424a8fab4c3947bcb7c03f.pdf
    • https://static.usrfiles.com/ugd/d162e3_fa766cdc74c943689d0ae1f51ad9a0d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cafbaa95d8724e1cbb564a3883c79c92.pdf
    • https://static.usrfiles.com/ugd/b8c837_92c89f0ed4484e788e34c4f08e9f3aa5.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/68040273056.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/outline_format_process_analysis_essay.pdf
    • https://cdn.shopify.com/s/files/1/0440/1889/2958/files/fevevufonewepo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/wagosemisowajimotin.pdf
    • https://cdn.shopify.com/s/files/1/0440/8301/9941/files/quiz_on_periodic_table.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_off00006f46.bin
7ad7a3c55d501d079afd7bfd899a3b3a6940256f006685d69eb78e04086d21f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F46 5308 bytes
font_01_sfnt_off00008180.bin
b840650b2cac7daf401364258299c48ddeb0c5224617ddfe94a5ce873d3927d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8180 10668 bytes