Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d499d5c51dc680…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 05:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: acc6b8da8069e3805d7b36f6875ef11a SHA-1: 2c16b0f395de460b60a775845526b86f5526e044 SHA-256: a8d499d5c51dc6800989e4118d44f527b2bf5db08921b91710cafd1d05c592c6
124 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lure users into clicking through to a harmful destination. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise the malicious intent. 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://gettraff.ru/strik?keyword=difference+between+administration+and+management+and+organisation+pdf In PDF document text
    • http://files.albertomagana.com/uploads/1/3/1/8/131856279/8efcaf36b3df.pdfIn PDF document text
    • http://kugikik.morrisseauartist.com/uploads/1/3/1/6/131606407/botifogi.pdfIn PDF document text
    • http://files.lambsworkshop.com/uploads/1/3/0/7/130739227/zogeresaroxodi_zixunewibe.pdfIn PDF document text
    • http://files.amanaefob.com/uploads/1/3/1/1/131164157/gizuluzebate.pdfIn PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/wopagafupapamofez.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/72305000185.pdfIn PDF document text
    • https://site-1037859.mozfiles.com/files/1037859/78184878004.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/teledajojevi.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/1/0434/1560/1314/files/lateral_area_of_rectangular_prism_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/clicker_heroes_2_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/rivuxujalepunugenobofuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3de363c-3acd-4f0b-8126-ae8db68c9886/12106010558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac6458f-1467-463f-9575-d60eb791ab9b/76187256776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0422a016-aa6e-4fd8-966a-cb8e33868e5d/96864882805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c172e3-aa2e-4341-b9b5-1d652e163eef/11093702276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af03072f-0a69-4e62-ae3b-792d582e021f/92419224918.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_off000065ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5672 bytes
SHA-256: 7dc4186f492ab75f6182ad71cbcc5009247ef2779513c4066fdb7734af69f928
font_01_sfnt_off00007905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7905 9516 bytes
SHA-256: b9e9a93c08cb23153986e8dfe1e5dc94de6d3d81ab40ed2b1b670e6a084e0dd7

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