Malicious PDF — malware analysis report

Static analysis result for SHA-256 9540b4c19f755b46…

MALICIOUS

PDF

68.9 KB Created: 2020-11-19 00:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dceedfa6c52a5877286ebe5b668fb38 SHA-1: 1bc285f39031fe2e0347a908208a1e935e8acfd2 SHA-256: 9540b4c19f755b4636b9ce0beaacba867bab2440c0cc30c9a5a5a993440dd596
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ClamAV detection strongly indicate malicious intent. The embedded links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=stick+rpg+2+director%2527s+cut+free
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4137914.pdf
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/kepazapedokegok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baposivarabuj/poplar_sheet_goods.pdf
    • https://s3.amazonaws.com/wilugugo/dokofejijevuxemijolajeb.pdf
    • https://s3.amazonaws.com/tokatefozude/uk_gcse_exams_2020.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/brave_new_world_webquest_answers.pdf
    • https://uploads.strikinglycdn.com/files/91e668be-3a8e-4d6e-bec6-e17a4cc8d9a2/59017114267.pdf
    • https://s3.amazonaws.com/minaxigevani/gidekijid.pdf
    • https://s3.amazonaws.com/teximikamukubo/township_hack_no_human_verification.pdf
    • https://s3.amazonaws.com/zetare/2731513589.pdf
    • https://s3.amazonaws.com/fopalew/rubber_sheet_suppliers_in_ahmedabad.pdf
    • https://uploads.strikinglycdn.com/files/b313635c-d399-4e2e-8d93-f0ab1414adea/mcpe_0.4.0_apk.pdf
    • https://uploads.strikinglycdn.com/files/42f25f26-4e12-49a2-bef4-e0b4108a1f2f/warforged_juggernaut_barbarian.pdf
    • https://s3.amazonaws.com/zonebon/zufabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd02.bin
6edcd7e6a8998645ce55f6745b643cd4bd28ceb848c5efc0f00f730964a23693
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 5416 bytes
font_01_sfnt_off0000df93.bin
19cce1deff1cc720c2e859a6f286c66bc1fc475318b5df363b708d42f2f1b27a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 11664 bytes