Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc57ccd631b97050…

MALICIOUS

PDF

46.4 KB Created: 2020-10-02 18:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fae89e2065ab92809800143461621d65 SHA-1: 915510f922cb8ada951583af0c9502e659fccf80 SHA-256: fc57ccd631b97050a2fd4cbe4440b69feed3d60fb165a5ced560ed300e0c0fe0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://cctraff.ru/pify?keyword=west+shore+band', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and metadata, suggesting it is not intended for direct user consumption but rather as a lure.

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/pify?keyword=west+shore+band In PDF document text
    • http://duwokewe.artsandengagement.co.uk/uploads/1/3/0/8/130873877/f1d489d9de230.pdfIn PDF document text
    • http://kevupejel.jgsnj.org/uploads/1/3/0/7/130738914/zevokiromun-jutosazibonaxug.pdfIn PDF document text
    • http://pezowul.suisunvalleyfillingstation.com/uploads/1/3/1/4/131453943/jewibet.pdfIn PDF document text
    • http://welenep.accesshope.org.au/uploads/1/3/0/9/130969904/6626828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b30a0d-d48b-47a0-a519-83e53b585c66/mebokiredogunijadirolunim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846d43c3-e877-4d2a-b3c4-324641ab10b2/rixitanekijugutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064c4f86-5f32-4a90-b208-7b8755e9546b/46911402905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddae2327-f22c-4d8e-90b3-6100be4306c8/50819895204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/green_mountain_gymnastics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7b32df-6852-4227-b3a6-883f48dc6123/katew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6939ba6-e3b6-436d-a455-f33062607785/tutixosazagavovutivolojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b27dcb-daec-4968-b2ac-93e89aead273/xafojonozudavibufasaku.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 5036 bytes
SHA-256: 0237f93610628d432c5aa5df1d572c69ac2056881a9b2a64257b71abc470eff7
font_01_sfnt_off0000721f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 10812 bytes
SHA-256: 6295b40fa693709e5e78e1758b58adf0fd7308ec6093dca1653568e18e966419
font_02_sfnt_off00009740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9740 16344 bytes
SHA-256: 9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189

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