Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ec71d8b7fd4535…

MALICIOUS

PDF

48.8 KB Created: 2020-10-06 12:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf018d09d195e46281f770162a6599f8 SHA-1: 3a046cc05edebeab2a49b7e0c23e88aae6ee511d SHA-256: c8ec71d8b7fd4535579b81508b5b0a2db3f6f7aa3b02682c75c52551905a15e4
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially obfuscated, includes the URL that triggered the malicious redirector heuristic, suggesting an attempt to lead the user to malicious infrastructure. The presence of multiple links to disposable hosting further supports a malicious intent to distribute further payloads or phish for information.

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://cctraff.ru/strik?keyword=curse+of+strahd+pdf+download+portugues In PDF document text
    • http://vuwajofe.root-and-branch-editing.com/uploads/1/3/1/3/131379312/779b137b.pdfIn PDF document text
    • http://files.kingboroughartprize.org/uploads/1/3/0/7/130776035/4205476.pdfIn PDF document text
    • http://files.debanjanmukherjee.com/uploads/1/3/1/4/131453555/1525667.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/9505725861.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/19594679383.pdfIn PDF document text
    • https://site-1039883.mozfiles.com/files/1039883/20861010394.pdfIn PDF document text
    • https://site-1039390.mozfiles.com/files/1039390/tonud.pdfIn PDF document text
    • https://site-1039733.mozfiles.com/files/1039733/6761362709.pdfIn PDF document text
    • https://site-1038439.mozfiles.com/files/1038439/tukalul.pdfIn PDF document text
    • https://site-1039646.mozfiles.com/files/1039646/goboxavivarorumewopixizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1299/2409/files/ati_teas_secrets_study_guide_download_free.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_off000073ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 5300 bytes
SHA-256: 75c890e13cab03ef50355e7d7ac5d2ab49aeaf3400d02badce6613f9a06f89f7
font_01_sfnt_off00008600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 15724 bytes
SHA-256: ab6ef130200bd425d62e6ac5ff80fb61a61b4d26f81bd679358b71484e629091

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