Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdcee9a48699807…

MALICIOUS

PDF

43.3 KB Created: 2020-09-30 18:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e636076752da535901ff5ef3774fe133 SHA-1: fed89564f59427d47ebd03c003bfa6fbc6f89e9e SHA-256: 2cdcee9a48699807451cc7d9b143a100263b7ba9c2fcfb3f7365b58083a14b73
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and one specifically to a known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=java+tutorial+for+absolute+beginners+pdf'. The ML classifier strongly indicated maliciousness, and the link farm heuristic confirms the suspicious nature of the embedded URLs. The document body, though heavily obfuscated, contains references to the malicious URLs, suggesting an attempt to disguise malicious links as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=java+tutorial+for+absolute+beginners+pdf In PDF document text
    • http://files.gpsfirstaidtraining.com/uploads/1/3/1/4/131437862/ganasamuzitu.pdfIn PDF document text
    • http://files.charankainth.com/uploads/1/3/0/8/130873903/3735563.pdfIn PDF document text
    • http://files.paulinegough.com/uploads/1/3/1/6/131606563/4355b.pdfIn PDF document text
    • http://files.rockymountainluxepuffpoodles.com/uploads/1/3/1/1/131164476/9d330.pdfIn PDF document text
    • http://files.tempete.net/uploads/1/3/1/4/131438330/9808067.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/30836862076.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/letekujek.pdfIn PDF document text
    • http://dokesez.cvilleathon.org/uploads/1/3/0/8/130813458/tuzupunijurabe.pdfIn PDF document text
    • http://bufof.mydigitaleyes.com/uploads/1/3/1/4/131483378/26269.pdfIn PDF document text
    • http://files.dementiatraining4life.com/uploads/1/3/1/3/131398504/jatipoloxu.pdfIn PDF document text
    • http://files.blueheronherbary.com/uploads/1/3/0/8/130814078/nimikoxonupu-rezipix-xibibafibe-xujikapotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/293e57b2-bf8d-4581-aeb3-e741061a5503/zekigetodewas.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_off00006a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A50 5400 bytes
SHA-256: b05df3a45bb7ac7b2393c4fccdd95b83391d0b97ca74d854dcd9f9372e8eddce
font_01_sfnt_off00007cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 10516 bytes
SHA-256: 17fb704f7a0ccc4625aa11086be3b4f6a65da9d652867ef2051e7eb13a331bcc

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