Malicious PDF — malware analysis report

Static analysis result for SHA-256 c551c0a450a75978…

MALICIOUS

PDF

54.4 KB Created: 2020-10-05 23:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 19696592b5f0c00472e7df55c31debe9 SHA-1: 6c1cfe42586df431329ce22fe2141f1a767a42ab SHA-256: c551c0a450a75978ac0ea28315629726017c3f91857a0d089ad71ea5b799f069
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/strik?keyword=graphic+design+portfolio+2020+pdf`. The document body, though heavily obfuscated, appears to contain similar text, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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://cctraff.ru/strik?keyword=graphic+design+portfolio+2020+pdf In PDF document text
    • http://lewim.steventurnbull.org/uploads/1/3/0/7/130739343/tetakuwevifelisaka.pdfIn PDF document text
    • http://files.dougsheat.com/uploads/1/3/2/6/132696198/ea430fc30b29fc4.pdfIn PDF document text
    • http://nokerowal.natalieasport.com/uploads/1/3/2/3/132302815/runejubukilat-kumibif-towepasu-fuwunuwegi.pdfIn PDF document text
    • http://biwufig.bhslibraryonline.com/uploads/1/3/2/6/132681459/1dad12c0bf.pdfIn PDF document text
    • https://site-1042777.mozfiles.com/files/1042777/73989544508.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/42735075645.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/kunosu.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/sesebivosudabimovusudeki.pdfIn PDF document text
    • http://files.moraefashions.com/uploads/1/3/1/6/131637312/629722.pdfIn PDF document text
    • http://vumizaso.cmcfn.com/uploads/1/3/1/3/131380345/da6022952.pdfIn PDF document text
    • http://files.anasaem.com/uploads/1/3/2/7/132710780/7791722.pdfIn PDF document text
    • http://mapam.vistasinthepiedmont.org/uploads/1/3/1/3/131383483/6691426.pdfIn PDF document text
    • http://wolesik.lanesboroughprimaryschool.ie/uploads/1/3/1/4/131453574/xobegesetu.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/824f53a3-a67d-44ae-b66b-724fde4b0afb/15632837752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a3c7b8-7ffd-496d-8d52-e44af80c090b/pakijosujifuredaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2fbbae-2ccc-42b6-8b8f-397cdf960b7c/97825125563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48e9357-ca3b-4eb7-80b6-23581d32757b/ragumovabikebonuf.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_off000094ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FF 5724 bytes
SHA-256: 7f216001b30b8fdb006d89c7fb1368541d12c5772851a3f2779b9b675e3fdb62
font_01_sfnt_off0000a87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA87F 10436 bytes
SHA-256: 033880c364b333a32894cbbeb1b625da891bd3835f82fadfe059e7ff58795975

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