Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd111655903d3ab…

MALICIOUS

PDF

37.8 KB Created: 2020-10-12 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ef1482caa4131f15f177e50e956eeb6 SHA-1: a3438886c8b63bfe683765112d19bbdabbe55de6 SHA-256: 3bd111655903d3ab89102c2f6e3f93689c78b4b0e790178bad0195339096b1dd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One URL, https://cctraff.ru/strik?keyword=smule+audio+downloader+apk, is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, suggesting the primary purpose is to redirect users to malicious or spam content. No scripts were extracted, but the structure and link farm heuristic indicate a malicious intent to drive traffic to potentially harmful sites.

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 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?keyword=smule+audio+downloader+apk In PDF document text
    • http://puwor.ultrasoundem.com/uploads/1/3/1/3/131380623/1624742.pdfIn PDF document text
    • http://komiku.robertweineroboist.com/uploads/1/3/1/0/131070786/pofumom.pdfIn PDF document text
    • http://files.nickrosencutter.com/uploads/1/3/1/4/131483266/d86f5a63f3c1.pdfIn PDF document text
    • http://jegez.grassybuttegoats.com/uploads/1/3/1/3/131378776/zijasiz.pdfIn PDF document text
    • http://zolupu.lcmamusic.com/uploads/1/3/1/3/131397997/1cc5275e6de524b.pdfIn PDF document text
    • http://files.samanthapassaniti.com/uploads/1/3/1/3/131398077/7607d47b2527c.pdfIn PDF document text
    • http://ruloto.samuelfamilylaw.co.uk/uploads/1/3/0/8/130814328/vokodero_josapa.pdfIn PDF document text
    • http://files.stgerardsbusiness.com/uploads/1/3/1/3/131378930/3115444.pdfIn PDF document text
    • http://files.cutediner.com/uploads/1/3/2/6/132682063/a887b3.pdfIn PDF document text
    • http://vibipug.faithlife.me/uploads/1/3/0/7/130738524/c088cc.pdfIn PDF document text
    • http://degudi.songalonglifesmarathon.com/uploads/1/3/2/6/132682711/2138461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/sotokidikabed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/14207412728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/bear_grylls_a_survival_guide_for_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/tojugokosusunafenubimefi.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_off000056ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AC 5188 bytes
SHA-256: dc06954c70bdb66aee54f64e1974a27822b672e0567042603343b6bedfdc00a9
font_01_sfnt_off00006845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6845 10020 bytes
SHA-256: 52a772718aa7a22c8cff374fce3683820ea3d211a6c179d41b32c6315e1c5b32

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