Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0f30bc358eb8f0…

MALICIOUS

PDF

36.8 KB Created: 2020-10-06 18:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0dad5a089eb2cef9b05037c71f2334c8 SHA-1: 2bc9c776b9245ed2c74cf491eef93886c46e8908 SHA-256: bd0f30bc358eb8f00c56a4a309bfaab03f3e1d2eb4d5019040c0e4a64a14bf8b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with the promise of "morphology and syntax exercises pdf". The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including one to a known malicious redirector, supports this. No scripts were extracted, but the document's structure and embedded URLs suggest a phishing or redirection attempt.

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/strik?keyword=morphology+and+syntax+exercises+pdf In PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/91143226200.pdfIn PDF document text
    • https://site-1039510.mozfiles.com/files/1039510/toxusifefesesoxebetuv.pdfIn PDF document text
    • https://site-1038783.mozfiles.com/files/1038783/varufubuwajuvawin.pdfIn PDF document text
    • http://lenusoja.prospecthill-omaha.org/uploads/1/3/1/3/131384635/f25a641134d.pdfIn PDF document text
    • http://files.daneyates.com/uploads/1/3/0/7/130739971/bilusesuberi.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/5faeb733-5a2a-4e0e-9ecf-5a0aa1ccfe81/ranod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc557a0e-8847-4ff8-861d-5858512bda39/10034727972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58238d24-e9be-401c-828e-c5559f72e4d2/sibuwovenorunozidolivaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83dd1847-b7d8-4053-bb4b-b9f1aab6fca5/delajesafate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43220d78-486f-4a84-89b3-5ca37176ac85/92504707646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad58c48-58c8-401d-911d-2c1229cde2a0/difavitusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b497267b-51ac-4db4-989b-3c7a13b0ff95/19896084306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8fc334-37a3-4f98-99d0-9c83a7d18b27/48871447419.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_off000051dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51DC 5592 bytes
SHA-256: 216a54b7cfbc08acc1b131849f2552c520f1c19dfa4f67517590ede0ac32f54a
font_01_sfnt_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 9840 bytes
SHA-256: 7cec25f8fa69217843bca93d56651ef33cf37ea56a7db65162e28fa552d427a0

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