Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dc8ea97e452ce9…

MALICIOUS

PDF

39.9 KB Created: 2020-11-05 08:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a1666fd8a8aca0868bd49389fd98b23 SHA-1: e5f274d1a981f307a26f2b227598089d85cfece4 SHA-256: 90dc8ea97e452ce98bbb6da75e05bfa487af30579c84bfbea7f9ec9e52f8f0d6
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The document body includes a lure for 'Filelinked apk app' and a URL that leads to malicious infrastructure, likely to download a secondary payload. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?keyword=filelinked+apk+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f89108428fd4.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/danakenarazo.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/venezi-pezejumuw-tugumizabax.pdfIn PDF document text
    • https://vuzejugusu.weebly.com/uploads/1/3/4/4/134486163/ca7f9fa988.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/bc4469.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/0e3cdd07-efe0-44d1-8543-4346f652cbfa/68920048553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b04443-7354-402a-b061-a10fa1e7eafa/63093086446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b07e75a-826b-4c69-bb25-fc555e865381/33259411978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8b27bf-3720-4dbe-bc7b-e6b745182ca6/50732814950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325947a2-dce1-4eed-b224-afbe4cc5ed4d/nabugipefazuruwefovofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259ef89e-78d4-48e0-ab38-837123fdc4dd/zanefo.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/entrepreneurship_development_programme_notes.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_off00005e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1E 4696 bytes
SHA-256: 997b44f274d2382d7e7e4eed72e9e95e8368080600e4ae23366de704dac975e6
font_01_sfnt_off00006e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2F 10876 bytes
SHA-256: cf544d07245197829a15cc2aee2e996b173d2c774119245785af9784e358edd2

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