Malicious PDF — malware analysis report

Static analysis result for SHA-256 6786eeda96643d02…

MALICIOUS

PDF

68.8 KB Created: 2020-10-12 04:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d0e2b1bcc52770e0542356a92d2e88bd SHA-1: 54e05467ae0165b8709e64f339add97c04fb2e5e SHA-256: 6786eeda96643d02f73c2474ce6ea35ba4af718c0ad97b42329d1fccfab30105
124 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the string 'Download terrarium apk', suggesting a lure for users to download an Android application package. 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.link/pify?keyword=download+terrarium+apk In PDF document text
    • http://files.ehechtennis.com/uploads/1/3/2/7/132712093/48d76b4d8379e4.pdfIn PDF document text
    • http://files.geras.sk/uploads/1/3/1/4/131453215/d9c401.pdfIn PDF document text
    • http://xulexowo.splendorabandboosters.com/uploads/1/3/0/7/130738732/db0914.pdfIn PDF document text
    • https://site-1040084.mozfiles.com/files/1040084/84829049201.pdfIn PDF document text
    • https://site-1037101.mozfiles.com/files/1037101/zilebixelijadivo.pdfIn PDF document text
    • https://site-1037905.mozfiles.com/files/1037905/webojejedajemubamedu.pdfIn PDF document text
    • https://site-1038898.mozfiles.com/files/1038898/80325816788.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/e02a15b0-82ab-4a45-9a9b-9fa3400f1919/365801178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934883e3-d44f-448d-b55e-f0fce9144efd/zolavikokuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e692cf0-a84f-4deb-9aa5-2aff4e408c19/judisonifekisiwozumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e4edb4-5508-4b84-928a-d4bc036c892e/14373332040.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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 5084 bytes
SHA-256: fa1c61f6b60211c669adad8e0bd3b521a7afae9f3a4e965da04c71933509efc0
font_01_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 14036 bytes
SHA-256: c648a8030ba06dbd3fefb47938d072e08592a5c831509b586306ab4209935615

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