Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9e99b24268e2bf…

MALICIOUS

PDF

41.5 KB Created: 2020-10-07 01:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 183ceb71363ec1111e3c9a36925e6703 SHA-1: a42fa78e5b80dea38b25013a4c8b522f9cb99786 SHA-256: eb9e99b24268e2bfa59fd5b238ded6d84d2001edebb2be4c8fa2dae8a091712c
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Broil king signet 320 gas grill', likely intended to entice clicks on the malicious links. 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=broil+king+signet+320+gas+grill In PDF document text
    • https://site-1037859.mozfiles.com/files/1037859/91153583221.pdfIn PDF document text
    • https://site-1041181.mozfiles.com/files/1041181/59852522232.pdfIn PDF document text
    • https://site-1038670.mozfiles.com/files/1038670/78375937818.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/96813973019.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/75466458198.pdfIn PDF document text
    • https://site-1039382.mozfiles.com/files/1039382/77480413193.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/segudew.pdfIn PDF document text
    • https://site-1043608.mozfiles.com/files/1043608/73692462325.pdfIn PDF document text
    • http://mobefof.opticavistaandina.com/uploads/1/3/1/4/131454172/ef2fdab7.pdfIn PDF document text
    • http://files.brepto.org/uploads/1/3/0/8/130874205/dudinipamuwiredefed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/bukegukonazobikizotezix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0518/1603/files/33798361044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/arbeitsauftrag_mech_dowels_big_mech_wow.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6318 5404 bytes
SHA-256: 929610d28c70fcc94e8f4be821ab5af88d27022619dd358f66a453e5aa750b2a
font_01_sfnt_off00007588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10588 bytes
SHA-256: 9a3098a8a3857559ff50025b2be323dbdabcd86e8342c5df813c7efd716fae86

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