Malicious PDF — malware analysis report

Static analysis result for SHA-256 8365ac9b7ef269fb…

MALICIOUS

PDF

44.8 KB Created: 2020-10-03 10:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d7ac01efa5bd4d5d5b85aab9b276415 SHA-1: 011c0437e6e7d10c5886718007ae4b237548479c SHA-256: 8365ac9b7ef269fb3f99c1259d87d0dbb088426d70cecb334231a562cac3c2cb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and contains numerous links to external PDF files, indicating a link farm designed for SEO manipulation. One of the primary links redirects to a known malicious infrastructure, suggesting an attempt to lead the user to a compromised or malicious site. The document body, though heavily obfuscated, contains text related to a "button mushroom growing kit amazon" and the malicious URL, likely serving as a lure.

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.
  • 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://gettraff.ru/pify?keyword=button+mushroom+growing+kit+amazon In PDF document text
    • https://site-1038499.mozfiles.com/files/1038499/85623168971.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/zabep.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/29159056979.pdfIn PDF document text
    • https://site-1039878.mozfiles.com/files/1039878/25775920351.pdfIn PDF document text
    • https://site-1038402.mozfiles.com/files/1038402/kijolugemelonelo.pdfIn PDF document text
    • http://files.northwestuu.org/uploads/1/3/0/8/130813497/betezulopivi.pdfIn PDF document text
    • http://bikanelin.brownhasiotis.com/uploads/1/3/1/3/131383377/f0fb5f2566.pdfIn PDF document text
    • http://files.seedlingscorp.org/uploads/1/3/0/9/130969153/sagugaxu.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/6df5bd4d-1fd2-4226-8fac-2c40ea10c5e2/muvixaraxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd8088a-9356-4bc5-ab6e-2bcff25e04e1/362832618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5bb11f-554a-4a7c-8de9-01d8cd8f8538/ruketosigedunovadez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6e9e2f-1099-4ad0-bad1-e2c466042067/nowelusejimukonusetexabov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085d07d8-461c-4cdb-b33e-345eca99bb79/71319341713.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_off0000712c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712C 5320 bytes
SHA-256: af69e306c0dc59a5fba90085482e043fb389e9a94e0c0745dd62377802d61be3
font_01_sfnt_off00008335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 10224 bytes
SHA-256: a9602cd8856b7fda359df15afdb2592eaddfc1bc8fff3c93689d90ca6bf1c650

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