Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2bb607da174e6…

MALICIOUS

PDF

52.1 KB Created: 2020-10-17 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d93e02b3e7a82b6a050c649df9fbbcb6 SHA-1: 9aed4949315f5998cc572682c46dc82c100809e4 SHA-256: 90a2bb607da174e660930cc0be28ae9e7e5e0fb3cbaa38cfbaa63b5083a17f80
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a document about electrical engineering formulas. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

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/123?keyword=all+formula+of+electrical+engineering+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8766a1b88b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f888b9be1977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f8a1445c05f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87ff08c81c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f87a4884aa41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f8a132242cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f88fead7cb2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f87b8106e5f0.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/9008297a-09de-47b2-b566-77ecd37f1f80/rituguwuzuzutebasilafutoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8b9b5a-76de-4ac7-92dc-eb5df6d4e92d/momuwizojesipabugizabim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8708954b-214a-4287-aabd-915f06b3bd70/6951677275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c2d966-2ff4-4204-88e4-2771e0e45567/vezubuximo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45c3602-8f80-46c4-a640-5af95262cc2a/57232155004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941e7c76-2f62-46f1-a7fb-cbff393ea9a7/vojopodegividevomep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b05e5d7-5dcc-4041-99c1-3f7e9eb9f562/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abb05bd-abdd-483d-bb3b-ca5c4e8100f6/parivugere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d0751d-02c0-496f-a426-f8a61342d0d0/62366232104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8640/8597/files/36624853278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6910/0198/files/furusoleridejol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2427/5866/files/word_whizzle_dry_measures_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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a7ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA7AB 17600 bytes
SHA-256: 0054afd49b4242c2681c7a75d18018be3257b55942c54bf5270812b8469f6bca
font_00_sfnt_off0000711b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711B 5284 bytes
SHA-256: b80b86c4c82e37512fe67c859b38bcfd0afa4491193d8e6f515399663946b2d4
font_01_sfnt_off000082fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FE 10640 bytes
SHA-256: 4f139339f47f6de21c766a29ea89aecdb68c91a9e345cf64c638c9efcb30f0c2

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