Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aef93df90855b1…

MALICIOUS

PDF

48.8 KB Created: 2020-10-16 16:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: fe36df311972d86d9af61a015148c8fd SHA-1: 008bb2054ef673812cc81b2d670a02316a915174 SHA-256: c4aef93df90855b190d9b662914ce4ee718a41694f6beaadf2bb01bff20ed809
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently featuring a URL that redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm heuristic further supports a malicious intent to drive traffic to potentially harmful sites.

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/123?keyword=quran+bangla+pro+apk In PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/a73cbec3e716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f87a951ecd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f888879256d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f87486973a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f87ba9894cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f88ab096181f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f880582add15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f89342cb94df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f890c16a0be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f890c5e4abde.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/7fe85959-f8c7-49b5-b67b-8f8131e9909f/11805426492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c686e51c-72e0-4c2f-bcd8-a67eee472ad5/25445560603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3caedd0-8266-449a-b66d-b0a88aacda79/numojuxadusufufulewara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae8c3fd-6985-4788-b9f5-c6e4427cf37b/vomejoluxozabezubobifari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650d84ea-936e-4e18-aebd-93fba839bcbe/68365465933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5842/9593/files/fejovuguzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5381/7252/files/zegube.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F6 1780 bytes
SHA-256: 61385085cd8815c87be96b20c5877a92f707218460aa90422c0f0187dbc093ed
font_01_sfnt_off00006fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 5072 bytes
SHA-256: 1ce7d92dc56ae873624e93f2e56c8be00a81fc84b89167bb342385ab7c4dc5c2
font_02_sfnt_off00008100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8100 4700 bytes
SHA-256: 9edf441ca4d70a3a3f5ff884c11fd2109ea115f6361b9f51dc22478696b88245
font_03_sfnt_off00008ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF5 10480 bytes
SHA-256: 52a3780045021c0da814b520927d05956fbf97255b833b814186f7e21642c53b

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