Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f53f9d2a16c1c65…

MALICIOUS

PDF

57.8 KB Created: 2020-10-12 19:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6861b5e82134e25f2dcd5edbf6fd45d3 SHA-1: 00f22e9be0359fe628d20d1d74473077c4568967 SHA-256: 7f53f9d2a16c1c654f789eb0f27885b8aa39bd47a40edd13a32e5be038f0903b
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to disposable domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. This suggests the primary goal is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=central+dogma+of+protein+synthesis+pdf In PDF document text
    • http://files.qqha.com.au/uploads/1/3/1/0/131070207/ec986.pdfIn PDF document text
    • http://zasaba.deyoungconsulting.com/uploads/1/3/1/8/131859042/xepuzilo.pdfIn PDF document text
    • http://files.groovycoolstuff.com/uploads/1/3/1/4/131406722/818e9f71.pdfIn PDF document text
    • http://tawada.passantefinancial.com/uploads/1/3/0/8/130874359/ximamaxef_nojazusamu_ralaf.pdfIn PDF document text
    • http://files.sherpublishing.com/uploads/1/3/1/3/131398542/bf5eb688.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/kikoguruboxu.pdfIn PDF document text
    • https://site-1041503.mozfiles.com/files/1041503/zowuxa.pdfIn PDF document text
    • https://site-1042287.mozfiles.com/files/1042287/91222072139.pdfIn PDF document text
    • http://files.enotecaathena.com/uploads/1/3/0/8/130813757/nodixijo-fexuxuw.pdfIn PDF document text
    • http://rojexo.uclappa.com/uploads/1/3/1/1/131163690/8577404.pdfIn PDF document text
    • http://files.bowl-of-greens.com/uploads/1/3/2/7/132740547/mukin.pdfIn PDF document text
    • http://files.norcalpermitservice.com/uploads/1/3/0/8/130813985/6625037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EA 5464 bytes
SHA-256: 4d7759a42f381b8e0742798d925059744324f9c741bd9a0c2f54eb7f15cf7e0a
font_01_sfnt_off0000b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 10684 bytes
SHA-256: 2c63cde03dc19838053f274fd880e162ac6b4c1c4289855e2b43f3646165127f

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