Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c4bc4f069982ea…

MALICIOUS

PDF

46.2 KB Created: 2020-10-08 23:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e7224070d7a649fe155a65383839d26 SHA-1: 9178a536d55b2becc02e1c6a17fa3f2d2dbb8a67 SHA-256: 13c4bc4f069982eae61e89e4c0bf2d10de3fb8ebf6efaf128e233311f7753df5
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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://cctraff.ru/strik?keyword=learn+photoshop+step+by+step+pdf In PDF document text
    • http://lazefor.abrenian.com/uploads/1/3/1/3/131379730/4a240b8c9132b.pdfIn PDF document text
    • http://pamisan.ctdaus.com/uploads/1/3/2/6/132695375/a479cde7067.pdfIn PDF document text
    • http://files.parklanestablesponyclub.com/uploads/1/3/1/4/131438891/fexosemeva_supudigivumu.pdfIn PDF document text
    • https://site-1042983.mozfiles.com/files/1042983/wajizaposezuvuvedoxupidaw.pdfIn PDF document text
    • https://site-1039556.mozfiles.com/files/1039556/gojabogoxufaniletum.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/51483110594.pdfIn PDF document text
    • https://site-1039565.mozfiles.com/files/1039565/vevotuwono.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/69b8aaa1-b73d-4f7a-bd34-2e49b6005ee7/83221323723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e9b302b-e32d-4e5b-8a38-2346781f1448/zaporizujoxuwaxufowese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98b6882-107a-44f6-9313-4d6d89821a59/finuw.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_off00006946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 5020 bytes
SHA-256: 7152432b54ef5adc50d606bd5afb7b3c5f15a0aeb497b14992ed3f2acbcb0424
font_01_sfnt_off00007a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A44 10428 bytes
SHA-256: 219bea7d630f3b7ab3b711e002e7c63f09b1994faa06b9abb04aefcc259bb20f
font_02_sfnt_off00009de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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