Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb389e26705ce11…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 07:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2771c08f219d630579e729c2c145323 SHA-1: 1d44f1b10006f602cb98f11b656225c88655c2cf SHA-256: ecb389e26705ce1171faf5594647cb3f91aa41a83c0327912eb72ef5ef78e58c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains a lure to install a browser extension, which is a common social-engineering tactic. It embeds numerous links, one of which, https://ggtraff.ru/123?keyword=facebook+dark+mode+chrome+extension, redirects to known malicious infrastructure. The document body itself is heavily obfuscated and contains a reference to this malicious URL, further indicating malicious intent.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?keyword=facebook+dark+mode+chrome+extension In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f93d534ac42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f9b7fd57eac1.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/de1873099dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f8be7d953c59.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/bonirisima.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/42e356fa-9ba6-4c1c-a62b-0a70b8adc480/zubujizazupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77a3843-9b97-4b41-b7ac-784a039ca041/44373074484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ca75f2-7276-441a-bf00-b7071dc61b8e/pidina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f5b4d1-023c-46e1-a07b-45e80e976865/83050433036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b6a264-d835-419a-8ba9-5dc10aaff881/86800643611.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/jobaweraxisuwigadagij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186a27b6-e4a1-49f2-b753-b3048b6ef7bf/68737251084.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_off00005e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 5376 bytes
SHA-256: d7192527d729f16dcbfe83be2923c554a4bba8f4001241329d5d59f83443e384
font_01_sfnt_off0000707d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 1760 bytes
SHA-256: 356a37b9f63ae8d6c68868e444aa7881b7b042cfbd5d510e3e808324c2720ca1
font_02_sfnt_off0000792d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792D 10584 bytes
SHA-256: e14a57cd43efcea5fb89bab6aa608e0b2d48a18ffc5e2461cb4cd751b2c4c98d

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