Malicious PDF — malware analysis report

Static analysis result for SHA-256 763cc8e94f95c920…

MALICIOUS

PDF

49.8 KB Created: 2020-11-08 01:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 657da79ddaa6aacbffce62d561485d3c SHA-1: d4ec99b0b14dc7845d3f6cadd68d68ef19597266 SHA-256: 763cc8e94f95c920963a297683f9cca3abcbb2118fe0e64cf6a60ae5a2a9a09c
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'watch 50 shades of grey online 123movies' and includes the malicious URL. The presence of multiple links to disposable hosting and a high ML classifier score further indicate malicious intent.

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://gettraff.ru/123?keyword=watch+50+shades+of+grey+online+123movies In PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/7123810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5fa00ef409328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://xarewexupi.files.wordpress.com/2020/11/fukelomubuwuvukixobugir.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/kozise.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://pomutap.files.wordpress.com/2020/11/3_dot_tattoo_meaning.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_off0000804b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804B 6224 bytes
SHA-256: 35a3150c241bc31654e467a7941a4621ac05a4e3fc27e092d605edb3ee0372f7
font_01_sfnt_off00009572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9572 11076 bytes
SHA-256: d4766a01fccfeb67f5dd3972850a3200a2ef3b825230d862ca61587f19b68cea

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