Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac311793a852b098…

MALICIOUS

PDF

40.9 KB Created: 2020-11-08 20:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c5c88e53a00f3786fef491fab24bf144 SHA-1: 17149fcd14b283c6215be75c790e06e90ba0922f SHA-256: ac311793a852b098a123244788bf79edeac75e02da29c87e4b941529ca02dffd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it's a link farm. One of these URLs, 'https://traffine.ru/123?keyword=pegasus+vs+unicorn+vs+coutl', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://traffine.ru/123?keyword=pegasus+vs+unicorn+vs+coutl In PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/vizeximamaxetas.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/kinifipi.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/2ccb6969-3b3d-41d8-9220-767dc7b1b393/jivojikag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1176176-1628-4751-8d62-496654efdb4a/88260866937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb2a4cc-8b3c-4122-9c5c-25843eaa5475/38921046088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c348dd65-e15b-46ec-8785-c0b40fc04f11/kuvejujomopemizaputagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c12efac-22f3-4111-a713-237aeb8fef70/magijuxasilimewak.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/practice_book_mathematics_for_jee_main_and_advanced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df9c6ca-d65e-4795-9d44-9b341ffe0c39/53127577811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f206c6-63c8-4a54-ac34-97dfbc709c36/borakazekikutirilexavunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dc9ded-b6e0-4ec5-9011-b72bcd638fe7/shorthand_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ec71e2-51e5-4cd9-b6bc-82665635ee82/74495666044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f39cfc5-6f12-440d-86fa-61ff1b8bcae4/58815620063.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_off000060d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 5028 bytes
SHA-256: 4ca3f56cc76ef61fa1e52b5e20b5802b2dc07f0b8fa0198872998660f4a6a4e4
font_01_sfnt_off0000720a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 10792 bytes
SHA-256: e1d9ceaa4cc166fde718b98de0956e12b22823893c9976ce248e4fb40f86ca24

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