Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8038e46a7db8b49…

MALICIOUS

PDF

76.3 KB Created: 2020-12-28 05:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 60bc0c80761197d800883da6730a37c6 SHA-1: ebff27ebc5f71d858968be49ed13afc6a65b1411 SHA-256: f8038e46a7db8b49efb346fa5543d8bec17afc9f40ddc481b67b9a86dc3fd0b1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to trick users into downloading a game mod apk. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, suggesting a broader campaign to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=download+game+cooking+master+fever+mod+apk In PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/8367975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fa305c4389aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fb477618180b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f9262f81af3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fcd73c548328.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/tujeviwakirawu/midedofekakogonalufifexu.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/buvovulaminotufazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aca1467-4724-4c3e-b357-e79dc00378f2/lirawidigepodoga.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/norma_asme_b31_3_em_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73353365-fe69-4d98-a166-87800d8fdc66/game_hack_tool_apk_no_root.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/heineken_malaysia_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08508335-cf8e-4848-ae06-1478c438ec7e/guide_minecraft_ps3_francais.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/reverse_phase_high_performance_liquid_chromatography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dedf8de-efa8-4b10-a9a4-7b045f720fb4/99222496223.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/26898722210.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 5688 bytes
SHA-256: af9e3b17e6154da79935ae4a73469180720bdb2c2f38ee43d676eadb66a61188
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 1800 bytes
SHA-256: e832da2c338e61ec37a03eea38bd22ab9d68740a5f093a31caa869643a82502b
font_02_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 15792 bytes
SHA-256: 481dfdd06ea57c1229a7232bc3126e8eb4c2d4c4ab8ad1863188d7267d8f34fe

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