Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e92a7b96a6d719d…

MALICIOUS

PDF

49.5 KB Created: 2020-10-26 11:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 168d47f7d806fb110d06ca25d27530c9 SHA-1: 818de50bd8d41e9c62512600d9ba1c86d048dd2f SHA-256: 3e92a7b96a6d719da3a1d377bd6108d2fcba5780ea9a3ccb89c4a3c6ac05680e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to a 'sinhala english translator apk'. The document body also contains this URL and numerous other links to PDF files, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://ttraff.link/pify?keyword=sinhala+english+translator+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f902d2901c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f94ebbde1e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5f96189ff3853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f924a03a0f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f8cbb645742c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f889a190f330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8bb9f649f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f8df28fd2375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f88834b4a26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5f91d90b20abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f8e4e7a81864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f8fe5eeb9b20.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/351a7c1f-b7d8-44d4-9072-8cd1ce7648a7/ralavejexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a3d29c-be83-464a-b915-64cf8ff0ff46/moxedegefafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b63a28d-8096-45d5-9952-dfa17c0a6492/jiruxagomuniwozogeravatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7903/5808/files/52323376280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4104/5145/files/81132182411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/greatest_showman_from_now_on_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9931/6131/files/zelitaragasanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7673/0528/files/ch_7_membrane_structure_and_function_answers.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_off0000832f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832F 5248 bytes
SHA-256: 1205d0a8265882417ba738bc109fdc5054e86d324a55fd15947043d9db7514f6
font_01_sfnt_off000094f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F7 10492 bytes
SHA-256: 1fe57395f5543fe20299d2ae7313764dc36ed7ae2537b8f95d9e515881467d5e

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