Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8dd53e144a60df…

MALICIOUS

PDF

60.4 KB Created: 2020-11-04 03:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ac541f09aed038e52ada95eeac02c8e9 SHA-1: 14aaaa72e54076f6df616972eed2c1427941ea1f SHA-256: 4f8dd53e144a60df8e7a2498261706d2fe6944efb046367e1850fddd0ab3408f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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=song+title+generator+pop In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f9ae2c7245ac.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/582d09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8bd83ac8b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f89b5c6aed9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5f9da405980c1.pdfIn PDF document text
    • https://levibezime.weebly.com/uploads/1/3/3/9/133986639/e4554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8c6c1cdda68.pdfIn PDF document text
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/bukalovatepotog_zuwunigidos_disekedixajo_filaloguji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/likelihood_ratio_test_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/calendario_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/21603205837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace916eb-e9a9-4a5d-9058-d3de35afc756/zitepadibuwoxemewi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 4912 bytes
SHA-256: 52f1a199bed8221ec5b4d33cbd237cf4945a3718bd361db566eabf3513dcdb27
font_01_sfnt_off0000a872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA872 11848 bytes
SHA-256: af4a2e8dfff262dc8b809126b02ff590087b16c4d3f0a8fbaacdfb9b91ebe4fe
font_02_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 16124 bytes
SHA-256: e9bc778c3b65b79f54d456b1d21f0ab37f3a62dcf8da49c2887d05da31f64424

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