Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9110351436ff88…

MALICIOUS

PDF

49.3 KB Created: 2020-10-05 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4f61a9b706a3a7e088f33060c9ca02f SHA-1: e3d51095d443f028b2d11265dcd4c9f0e6a275a2 SHA-256: 7d9110351436ff8894b0597612805e5061d972d5b5ec14b807cf55f68f80a711
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded links that lead to a known malicious redirector infrastructure. The document body, though partially obfuscated, contains text suggesting a fake invoice or payment lure, aligning with the 'SE_INVOICE_LURE' heuristic. The primary attack vector appears to be tricking the user into clicking the malicious link, which likely leads to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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?keyword=dispositivo+esta+fuera+de+linea+setr In PDF document text
    • https://site-1039427.mozfiles.com/files/1039427/20458461107.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/bovotizenu.pdfIn PDF document text
    • https://site-1043260.mozfiles.com/files/1043260/fupevodibanefovusogalafe.pdfIn PDF document text
    • https://site-1037096.mozfiles.com/files/1037096/49763147118.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/4936278539.pdfIn PDF document text
    • http://files.plantingtotrain.com/uploads/1/3/1/4/131438164/7845700.pdfIn PDF document text
    • http://files.emma-kassel.com/uploads/1/3/1/3/131380063/83eddbb.pdfIn PDF document text
    • http://lamatu.santamonicaquiltguild.org/uploads/1/3/2/8/132814930/65de7e678b.pdfIn PDF document text
    • https://site-1036691.mozfiles.com/files/1036691/90631532744.pdfIn PDF document text
    • https://site-1037844.mozfiles.com/files/1037844/zofifurozo.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/kukegeronizivibirowizene.pdfIn PDF document text
    • https://site-1042450.mozfiles.com/files/1042450/2551130456.pdfIn PDF document text
    • https://site-1040885.mozfiles.com/files/1040885/medofejorebuwisif.pdfIn PDF document text
    • https://site-1040506.mozfiles.com/files/1040506/65936402388.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/lumovobenil.pdfIn PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/fewagukijod.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/16303027485.pdfIn PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/gezazinixiboxogom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 5096 bytes
SHA-256: 6d355c957dfbfa4a61dc1f5034b04ae3af316ed0fa3dcfd9c5bf109dc9274367
font_01_sfnt_off000091e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E4 11768 bytes
SHA-256: 409e53a04ee43b20ee31e65c323a48d320292a63931b2c6dae138d60d697ff9d

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