Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88a9ca7aeac7044…

MALICIOUS

PDF

80.0 KB Created: 2021-01-13 14:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5f12ac4c59d3fdcf64a352699472c8f SHA-1: 3859dd4ca7bcaecd774e8b8794975b96badd5edd SHA-256: f88a9ca7aeac70447c833a18b601a5597cc85a821856629d86bb092c2937f6aa
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic firings indicate the document is a link farm designed to lead users to potentially harmful content, such as game mod downloads which are often used as lures for phishing or malware. No scripts were extracted from this sample, but the presence of malicious links and the ML classifier's high confidence score strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/aws?utm_term=mortal+kombat+x+all+characters+mod+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ffeb75995bf5.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/169100.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/fusejokor-karuvus.pdfIn PDF document text
    • https://felavutiz.weebly.com/uploads/1/3/1/1/131164211/9d3bd0a1a93c.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/qy6idD4/90194211270.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/jazetirasepirug_romonebijagu_bukatejozitim_sugazul.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/debuxefizaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/eihbjjg/career_exploration_projects_for_high_school_students.pdfIn PDF document text
    • https://site-1174930.mozfiles.com/files/1174930/babobavevesazutese.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/3348753.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/9085134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rovikibixu/66157286529.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/kojeluvatikowik.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5224 bytes
SHA-256: debf73d329aae0e224812b3248307cc795c312a54626f2c04ed032898fbb9717
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10300 bytes
SHA-256: 254fa7a354f262ef7f7faf6f243312a5de09639db2e55a4336988fd8ec736952
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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