Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3f320f6a3a5c0…

MALICIOUS

PDF

49.5 KB Created: 2020-10-10 22:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1d253b9bfb9b0f0706db11d2c71bfd7 SHA-1: e42330e11256f8ce62edb5d77d1e7acbcf493e3e SHA-256: a5e3f320f6a3a5c05dfb36066fa3decd4904eb2bc2b88a413113296a83ed1cfe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious due to its function as a link farm, containing numerous links to external websites. One prominent URL, 'https://cctraff.ru/pify?keyword=math+and+the+bible', is flagged as a known malicious redirector. The document's structure and the high number of outbound links suggest an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://cctraff.ru/pify?keyword=math+and+the+bible In PDF document text
    • https://site-1040663.mozfiles.com/files/1040663/putuveleno.pdfIn PDF document text
    • https://site-1039235.mozfiles.com/files/1039235/kezodugogudoz.pdfIn PDF document text
    • https://site-1039328.mozfiles.com/files/1039328/36185148838.pdfIn PDF document text
    • http://nupuzu.crazy-piglet.com/uploads/1/3/0/8/130874277/0e02811e.pdfIn PDF document text
    • http://files.stlouismobilevet.com/uploads/1/3/0/7/130738841/6894713.pdfIn PDF document text
    • http://sigevaxa.alishameyer.com/uploads/1/3/1/4/131407995/8a4ccd32bd279.pdfIn PDF document text
    • http://saxoze.carvetta.com/uploads/1/3/0/8/130814297/zexuduzix.pdfIn PDF document text
    • http://SillyDaddIn 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/1/0499/1870/5825/files/ademco_alarm_keypad_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/27098526672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736abab0-475f-4dd3-ad7e-54ce61ec24e0/47292236433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5efc5f-8c6b-4002-9e0d-b1a9853a4017/65009151812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f23d55-6c8d-428b-9d50-8773bc1c7f86/72271814582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909cc723-cddc-44f5-b95c-bbeb1d0d2fae/72153852931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06fc4e8-e77a-48f0-8101-0b5d6ed08cd9/26728926807.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_off0000846f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846F 4784 bytes
SHA-256: 23f624525d845867be2315fd650686b216fa6187227c7a2f5ea6e65fb7818ee0
font_01_sfnt_off000094ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94AC 10916 bytes
SHA-256: 861b96fae836de0dc495a357c6ed05b228fd941ffd56f4bbfe7e7bc758e07582

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