Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6ad4e13ca7c3cf…

MALICIOUS

PDF

45.8 KB Created: 2020-10-09 16:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 310c83c7057c8c8e85edd1918f40caee SHA-1: 6c0eeb844c0d6d9e9034517113de925a4eefb19c SHA-256: ee6ad4e13ca7c3cf4a157b101f12f9ae641ee4042609ef7adf1854ce68ebd75c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to graphing functions and includes the malicious URL, suggesting a lure to a site hosting further malicious content. The ML classifier 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://cctraff.ru/strik?keyword=graphing+exponential+functions+worksheet+algebra+1+pdf In PDF document text
    • http://files.mauritzvandenworm.com/uploads/1/3/1/4/131453251/5410850.pdfIn PDF document text
    • http://files.eastwestmassagestudio.com/uploads/1/3/1/8/131856516/zodunapakug.pdfIn PDF document text
    • http://files.m.kaltydesigns.com/uploads/1/3/1/4/131438282/5388253.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/77104338977.pdfIn PDF document text
    • https://site-1038992.mozfiles.com/files/1038992/39108291802.pdfIn PDF document text
    • https://site-1038413.mozfiles.com/files/1038413/labozeviguxabala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48b4390a-cb84-4918-8819-3ca285c0d605/pugejed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d0cc8a-d9ec-4e84-b29a-af5d20f17c70/mekobakokabipajezavofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fe448d-5875-4cbb-b6e3-4e314f16bc65/zupasibogamijevud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20335f5-739c-4f60-ba14-8b7c8fe1fb06/kupezewetebiwilobojeziri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298e975b-70f9-4867-8b80-1c8165651662/37837955739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac05cfc3-e5f4-4823-8a0f-6c547352911b/kedasagejupawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2433a2a-de27-43f9-b111-5ff928382974/37935778107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2a45cf-f529-4328-b8c4-99d8f52c60fd/sidegade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4768cd25-63bd-45d3-b685-a82d11b7978d/xevoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656C 5748 bytes
SHA-256: 6ee4d7e48ada563f2c3a275bb481072285fdf9334a379a6688ce737470a15136
font_01_sfnt_off00007906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7906 10184 bytes
SHA-256: a951db0e94cb5bc4f8037b9fd55f9ccca30af72d22ded3bcffde1fd4bd650569
font_02_sfnt_off00009bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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