Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59991d17235a329…

MALICIOUS

PDF

57.5 KB Created: 2020-08-26 19:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf02ffe458043187611101afe7aec69 SHA-1: 74babd1dea4a6837ee65af2abde9c8aa01e69006 SHA-256: e59991d17235a329cbdc8ecf62c5cc09b6c4b012bf2ca7258eed6fb3108317b1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the link at https://ttraff.ru/pify?keyword=exercice+corrig%25C3%25A9+pression+art%25C3%25A9rielle leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests a large number of external links, likely to obscure the malicious destination. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this document.

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=exercice+corrig%25C3%25A9+pression+art%25C3%25A9rielle
    • http://files.nccforwomen.com/uploads/1/3/1/3/131383924/xikovage.pdf
    • http://files.pelebonitaspa.org/uploads/1/3/0/7/130738850/negevotusegax_wuzakunemenebov.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/24781123544.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/business_intelligence_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/58352913672.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7191/files/51249930297.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/lukefiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/14814814983.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/tisebetugawolerukobikuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0432/3809/7051/files/35080642151.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/toxusiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/jira_vs_confluence.pdf
    • https://cdn.shopify.com/s/files/1/0463/4909/0978/files/ielts_writing_test_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c49.bin
8e99643cf97aed9d3c28ea1d9100d072f7f706cc8df630a7eae437f08ed77dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 5056 bytes
font_01_sfnt_off00009d3e.bin
cdff1d2c3e95e0d002dbc1b9f098eba99bc96ddc2a8204eb1053c280352ee584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3E 14412 bytes
font_02_sfnt_off0000c846.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 4324 bytes

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