Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd58c036dd9290b…

MALICIOUS

PDF

47.1 KB Created: 2020-10-15 06:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f10e8c69762ad69cfa6b9a9b9c9f08a6 SHA-1: a4cd8884f3a07bc4567fabf940aa03997b0c1a3e SHA-256: 8bd58c036dd9290b4ed6e24a1962e7af5d3ef5ea087cb1f41b19b84a776bbdd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'beginners guide'. The primary attack pattern involves directing users to potentially harmful external 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://gettraff.ru/pify?keyword=legacy+of+discord+beginners+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f8782c2804f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f87153d43d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8722b74022f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f877fb6c14e0.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/8182286.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/xesukozumiver.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/f5a6a.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f877cbf83506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f879f06d4e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87107ac5a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8782b29d27f.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://cdn.shopify.com/s/files/1/0438/4355/1392/files/pinapedewuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1288/0541/files/icivics_one_big_party_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8604/5889/files/23698083830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/81184023748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd7058e-e641-46fe-b2df-016477396d20/14933471901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce466ee8-f081-4a14-971f-2bcb6d9dbb11/37915053726.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_off00006d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 5140 bytes
SHA-256: 50b0eae6586e10b7815467f2af3a1226aa9a444ce3a533d98c440fb3d98f4255
font_01_sfnt_off00007ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA4 10148 bytes
SHA-256: 44f854fb529bff2fa7ddc5c6e3a821e4f57d430f6d6e7fd01aa269182ef6d3e1
font_02_sfnt_off0000a13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA13F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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