Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71dd76d52d89e13…

MALICIOUS

PDF

70.2 KB Created: 2020-11-17 05:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 835d1f5a95b59e53e3d103bf68eeb643 SHA-1: bd32aa20d95e2eb231fba9e5282cc788128ac503 SHA-256: c71dd76d52d89e1339ac28d0a04a72afb61c27e61f3741ca0ab2647a21eddf6c
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a known malicious redirector. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. The document body, though heavily obfuscated, contains text related to 'MLB live stream free', suggesting a lure for free streaming content to mask malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=mlb+live+stream+free In PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/tirodazed_sigisikeraj_tubeseseduwop_xoguzamasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5fa03f27699fb.pdfIn PDF document text
    • https://lugeluwad.weebly.com/uploads/1/3/4/3/134328935/e93919f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_5fad13f95f292.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/zukedamuvuveg-jesire-tazikek.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/974d16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f9084a532137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f9dfc53d2b6a.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/kavitokolezub/7504366147.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/loliwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b28790-fdaa-483d-b9e0-ae510163143a/xoguvilipelixajogober.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/78897065258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cde0a5b-6fc9-4f44-8da0-47e5fce4093d/tugepoxukalevojakekomejaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/38326578790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de646598-1ca5-4771-9311-b242ca853657/wakufafuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29406ee3-54ba-471a-8b67-2118c9fe2c7d/tuvukefidanon.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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 5120 bytes
SHA-256: 41383b3685323ddebec68ee8a13952cc53aae20366fa6110231313ded05acdab
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 10656 bytes
SHA-256: e6de80b66f2fa58c2bb96c8f9c30643452febd5e5686a40ddbd8d05ff5791180

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